diff --git a/README.md b/README.md
index 0743da1..cbce339 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@ Is an implementation of CasparCG 2.0 AMCP Protocol and OSC Protocol
 
 Requirements
 -----
- - CasparCG v2.0.7
+ - CasparCG v2.0.7|v2.3.0
  - PHP 7.0
  
 Installation
diff --git a/composer.json b/composer.json
index 7ad40e7..c9155aa 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
   "minimum-stability": "dev",
   "prefer-stable": true,
   "require": {
-    "php": "^7.0"
+    "php": ">=7.0"
   },
   "autoload": {
     "psr-4": {
diff --git a/src/Command/Basic/Builder/AddBuilder.php b/src/Command/Basic/Builder/AddBuilder.php
index 4babea3..27d10af 100644
--- a/src/Command/Basic/Builder/AddBuilder.php
+++ b/src/Command/Basic/Builder/AddBuilder.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace CosmonovaRnD\CasparCG\Command\Basic\Builder;
@@ -114,7 +115,7 @@ protected function buildChannel(): string
     protected function buildDeckLink(): string
     {
         if ($this->deckLink) {
-            return 'DECKLINK ' . $this->deckLink;
+            return 'DECKLINK '.$this->deckLink;
         }
 
         return '';
@@ -123,7 +124,7 @@ protected function buildDeckLink(): string
     protected function buildBluefish(): string
     {
         if ($this->bluefish) {
-            return 'BLUEFISH ' . $this->bluefish;
+            return 'BLUEFISH '.$this->bluefish;
         }
 
         return '';
@@ -150,7 +151,7 @@ public function buildAudio(): string
     public function buildImage()
     {
         if ($this->image) {
-            return 'IMAGE ' . $this->image;
+            return 'IMAGE '.$this->image;
         }
 
         return '';
@@ -159,10 +160,10 @@ public function buildImage()
     public function buildFile(): string
     {
         if ($this->file) {
-            $result = 'FILE ' . $this->file;
+            $result = 'FILE '.$this->file;
 
             if ($this->separateKey) {
-                $result = $result . ' SEPARATE_KEY';
+                $result = $result.' SEPARATE_KEY';
             }
 
             return $result;
@@ -174,10 +175,10 @@ public function buildFile(): string
     public function buildStream(): string
     {
         if ($this->stream) {
-            $result = 'STREAM ' . $this->stream;
+            $result = 'STREAM '.$this->stream;
 
             if ($this->streamArgs) {
-                $result = $result . ' ' . $this->streamArgs;
+                $result .= ' '.$this->streamArgs;
             }
 
             return $result;
@@ -189,7 +190,7 @@ public function buildStream(): string
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $commandParts[] = 'ADD';
         $commandParts[] = $this->buildChannel();
@@ -202,7 +203,7 @@ public function build(): string
             $this->buildAudio(),
             $this->buildImage(),
             $this->buildFile(),
-            $this->buildStream()
+            $this->buildStream(),
         ];
 
         $consumerCommandPart = null;
@@ -210,7 +211,7 @@ public function build(): string
         foreach ($consumerBuilders as $consumerBuilder) {
             $consumer = $consumerBuilder;
 
-            if (strlen($consumer)) {
+            if ('' !== $consumer) {
                 $consumerCommandPart = $consumer;
             }
         }
@@ -222,9 +223,8 @@ public function build(): string
         $commandParts[] = $consumerCommandPart;
 
         $commandParts = array_filter($commandParts);
-        $command      = join(' ', $commandParts);
 
-        return $command;
+        return implode(' ', $commandParts);
     }
 
     #endregion
diff --git a/src/Command/Basic/Builder/CallBuilder.php b/src/Command/Basic/Builder/CallBuilder.php
index 644e80b..7ca4b4a 100644
--- a/src/Command/Basic/Builder/CallBuilder.php
+++ b/src/Command/Basic/Builder/CallBuilder.php
@@ -1,8 +1,12 @@
 <?php
+
 declare(strict_types=1);
 
 namespace CosmonovaRnD\CasparCG\Command\Basic\Builder;
 
+use function array_filter;
+use function implode;
+
 /**
  * Class CallBuilder
  *
@@ -22,13 +26,6 @@ class CallBuilder extends LoadBgBuilder
 
     #region setters
 
-    /**
-     * Set INVOKE
-     *
-     * @param string $command
-     *
-     * @return \CosmonovaRnD\CasparCG\Command\Basic\Builder\CallBuilder
-     */
     public function invoke(string $command): CallBuilder
     {
         $this->invoke = $command;
@@ -40,19 +37,21 @@ public function invoke(string $command): CallBuilder
 
     #region builders
 
-    protected function buildInvoke(): string
+    protected function buildInvoke(bool $legacy): string
     {
-        return null !== $this->invoke ? sprintf('INVOKE "%s"', addslashes($this->invoke)) : '';
+        $invoke = $legacy ? 'INVOKE' : '';
+
+        return null !== $this->invoke ? sprintf('%s "%s"', $invoke, addslashes($this->invoke)) : '';
     }
 
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $commandParts[] = 'CALL';
         $commandParts[] = $this->buildChannel();
-        $commandParts[] = $this->buildInvoke();
+        $commandParts[] = $this->buildInvoke($legacy);
         $commandParts[] = $this->buildLoop();
         $commandParts[] = $this->buildTransitionGroup();
         $commandParts[] = $this->buildSeek();
@@ -61,9 +60,8 @@ public function build(): string
         $commandParts[] = $this->buildAuto();
 
         $commandParts = array_filter($commandParts);
-        $command      = join(' ', $commandParts);
 
-        return $command;
+        return implode(' ', $commandParts);
     }
 
     #endregion
diff --git a/src/Command/Basic/Builder/ClearBuilder.php b/src/Command/Basic/Builder/ClearBuilder.php
index af6f5b1..ae8818b 100644
--- a/src/Command/Basic/Builder/ClearBuilder.php
+++ b/src/Command/Basic/Builder/ClearBuilder.php
@@ -3,6 +3,9 @@
 
 namespace CosmonovaRnD\CasparCG\Command\Basic\Builder;
 
+use function array_filter;
+use function implode;
+
 /**
  * Class ClearBuilder
  *
@@ -17,14 +20,13 @@ class ClearBuilder extends BaseBuilder
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $commandParts[] = 'CLEAR';
         $commandParts[] = $this->buildChannel();
 
         $commandParts = array_filter($commandParts);
-        $command      = join(' ', $commandParts);
 
-        return $command;
+        return implode(' ', $commandParts);
     }
 }
diff --git a/src/Command/Basic/Builder/LoadBgBuilder.php b/src/Command/Basic/Builder/LoadBgBuilder.php
index c7e16ad..10f039e 100644
--- a/src/Command/Basic/Builder/LoadBgBuilder.php
+++ b/src/Command/Basic/Builder/LoadBgBuilder.php
@@ -109,7 +109,7 @@ public function loop($loop = true): ExtendBuilderInterface
     public function transition(string $transition): ExtendBuilderInterface
     {
         if (!in_array(strtoupper($transition), static::transitionTypes())) {
-            $message = 'Transition must be one of the following values: ' . join(',', static::transitionTypes());
+            $message = 'Transition must be one of the following values: ' . implode(',', static::transitionTypes());
             throw new ParamException($message);
         }
 
@@ -138,7 +138,7 @@ public function duration(int $duration): ExtendBuilderInterface
     public function tween(string $tween): ExtendBuilderInterface
     {
         if (!in_array($tween, Tween::animationTypes())) {
-            $message = 'Tween param must be one of the following values: ' . join(',', Tween::animationTypes());
+            $message = 'Tween param must be one of the following values: ' . implode(',', Tween::animationTypes());
             throw new ParamException($message);
         }
 
@@ -155,7 +155,7 @@ public function direction(string $direction): ExtendBuilderInterface
         $directions = [self::DIRECTION_LEFT, self::DIRECTION_RIGHT];
 
         if (!in_array(strtoupper($direction), $directions)) {
-            $message = 'Direction must be one of the following values: ' . join(',', $directions);
+            $message = 'Direction must be one of the following values: ' . implode(',', $directions);
             throw new ParamException($message);
         }
 
@@ -261,9 +261,8 @@ protected function buildTransitionGroup(): string
             $transitionParts[] = $this->direction;
 
             $transitionParts = array_filter($transitionParts);
-            $transition      = join(' ', $transitionParts);
 
-            return $transition;
+            return implode(' ', $transitionParts);
         }
 
         return '';
@@ -338,7 +337,7 @@ protected function buildAuto(): string
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $commandParts[] = 'LOADBG';
         $commandParts[] = $this->buildChannel();
@@ -353,9 +352,8 @@ public function build(): string
 
 
         $commandParts = array_filter($commandParts);
-        $command      = join(' ', $commandParts);
 
-        return $command;
+        return implode(' ', $commandParts);
     }
 
     #endregion
diff --git a/src/Command/Basic/Builder/LoadBuilder.php b/src/Command/Basic/Builder/LoadBuilder.php
index 6ad197d..6c950d1 100644
--- a/src/Command/Basic/Builder/LoadBuilder.php
+++ b/src/Command/Basic/Builder/LoadBuilder.php
@@ -17,7 +17,7 @@ class LoadBuilder extends LoadBgBuilder
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $commandParts[] = 'LOAD';
         $commandParts[] = $this->buildChannel();
@@ -31,8 +31,7 @@ public function build(): string
 
 
         $commandParts = array_filter($commandParts);
-        $command      = join(' ', $commandParts);
 
-        return $command;
+        return implode(' ', $commandParts);
     }
 }
diff --git a/src/Command/Basic/Builder/PauseBuilder.php b/src/Command/Basic/Builder/PauseBuilder.php
index b0006da..071ba8f 100644
--- a/src/Command/Basic/Builder/PauseBuilder.php
+++ b/src/Command/Basic/Builder/PauseBuilder.php
@@ -17,14 +17,13 @@ class PauseBuilder extends BaseBuilder
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $commandParts[] = 'PAUSE';
         $commandParts[] = $this->buildChannel();
 
         $commandParts = array_filter($commandParts);
-        $command      = join(' ', $commandParts);
 
-        return $command;
+        return implode(' ', $commandParts);
     }
 }
diff --git a/src/Command/Basic/Builder/PlayBuilder.php b/src/Command/Basic/Builder/PlayBuilder.php
index 10c5b4b..db4b0fc 100644
--- a/src/Command/Basic/Builder/PlayBuilder.php
+++ b/src/Command/Basic/Builder/PlayBuilder.php
@@ -25,7 +25,7 @@ protected function buildClip(): string
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $commandParts[] = 'PLAY';
         $commandParts[] = $this->buildChannel();
@@ -40,9 +40,8 @@ public function build(): string
 
 
         $commandParts = array_filter($commandParts);
-        $command      = join(' ', $commandParts);
 
-        return $command;
+        return implode(' ', $commandParts);
     }
 
 }
diff --git a/src/Command/Basic/Builder/RemoveBuilder.php b/src/Command/Basic/Builder/RemoveBuilder.php
index d7ef161..e8da2f9 100644
--- a/src/Command/Basic/Builder/RemoveBuilder.php
+++ b/src/Command/Basic/Builder/RemoveBuilder.php
@@ -148,9 +148,7 @@ public function buildImage()
     public function buildFile(): string
     {
         if ($this->file) {
-            $result = 'FILE ' . $this->file;
-
-            return $result;
+            return 'FILE ' . $this->file;
         }
 
         return '';
@@ -159,9 +157,7 @@ public function buildFile(): string
     public function buildStream(): string
     {
         if ($this->stream) {
-            $result = 'STREAM ' . $this->stream;
-
-            return $result;
+            return 'STREAM ' . $this->stream;
         }
 
         return '';
@@ -170,7 +166,7 @@ public function buildStream(): string
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $commandParts[] = 'REMOVE';
         $commandParts[] = $this->buildChannel();
@@ -191,7 +187,7 @@ public function build(): string
         foreach ($consumerBuilders as $consumerBuilder) {
             $consumer = $consumerBuilder;
 
-            if (strlen($consumer)) {
+            if ('' !== $consumer) {
                 $consumerCommandPart = $consumer;
             }
         }
@@ -203,9 +199,8 @@ public function build(): string
         $commandParts[] = $consumerCommandPart;
 
         $commandParts = array_filter($commandParts);
-        $command      = join(' ', $commandParts);
 
-        return $command;
+        return implode(' ', $commandParts);
     }
 
     #endregion
diff --git a/src/Command/Basic/Builder/ResumeBuilder.php b/src/Command/Basic/Builder/ResumeBuilder.php
index f2a40c5..fcb501b 100644
--- a/src/Command/Basic/Builder/ResumeBuilder.php
+++ b/src/Command/Basic/Builder/ResumeBuilder.php
@@ -17,14 +17,13 @@ class ResumeBuilder extends BaseBuilder
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $commandParts[] = 'RESUME';
         $commandParts[] = $this->buildChannel();
 
         $commandParts = array_filter($commandParts);
-        $command      = join(' ', $commandParts);
 
-        return $command;
+        return implode(' ', $commandParts);
     }
 }
diff --git a/src/Command/Basic/Builder/SetBuilder.php b/src/Command/Basic/Builder/SetBuilder.php
index 3aaa9d5..e8b79f9 100644
--- a/src/Command/Basic/Builder/SetBuilder.php
+++ b/src/Command/Basic/Builder/SetBuilder.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace CosmonovaRnD\CasparCG\Command\Basic\Builder;
@@ -55,7 +56,7 @@ public function channel(int $channel): BaseBuilderInterface
     public function mode(string $videoFormat): SetBuilder
     {
         if (!in_array($videoFormat, self::videoFormats())) {
-            $message = sprintf('Video format must be one of the following values: ', join(',', self::videoFormats()));
+            $message = 'Video format must be one of the following values: '.implode(',', self::videoFormats());
             throw new ParamException($message);
         }
 
@@ -97,16 +98,15 @@ protected function buildMode(): string
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $commandParts[] = 'SET';
         $commandParts[] = $this->buildChannel();
         $commandParts[] = $this->buildMode();
 
         $commandParts = array_filter($commandParts);
-        $command      = join(' ', $commandParts);
 
-        return $command;
+        return implode(' ', $commandParts);
     }
 
     #endregion
diff --git a/src/Command/Basic/Builder/StopBuilder.php b/src/Command/Basic/Builder/StopBuilder.php
index f2dc874..c625c55 100644
--- a/src/Command/Basic/Builder/StopBuilder.php
+++ b/src/Command/Basic/Builder/StopBuilder.php
@@ -17,14 +17,13 @@ class StopBuilder extends BaseBuilder
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $commandParts[] = 'STOP';
         $commandParts[] = $this->buildChannel();
 
         $commandParts = array_filter($commandParts);
-        $command      = join(' ', $commandParts);
 
-        return $command;
+        return implode(' ', $commandParts);
     }
 }
diff --git a/src/Command/Basic/Builder/SwapBuilder.php b/src/Command/Basic/Builder/SwapBuilder.php
index 953e45b..3393078 100644
--- a/src/Command/Basic/Builder/SwapBuilder.php
+++ b/src/Command/Basic/Builder/SwapBuilder.php
@@ -77,22 +77,21 @@ protected function buildSwapChannel(): string
         $swapChannel = [$this->swapChannel, $this->swapLayer];
         $swapChannel = array_filter($swapChannel);
 
-        return join('-', $swapChannel);
+        return implode('-', $swapChannel);
     }
 
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $commandParts[] = 'SWAP';
         $commandParts[] = $this->buildChannel();
         $commandParts[] = $this->buildSwapChannel();
 
         $commandParts = array_filter($commandParts);
-        $command      = join(' ', $commandParts);
 
-        return $command;
+        return implode(' ', $commandParts);
     }
 
     #endregion
diff --git a/src/Command/CommandBuilderInterface.php b/src/Command/CommandBuilderInterface.php
index 0e102a1..0c24ac7 100644
--- a/src/Command/CommandBuilderInterface.php
+++ b/src/Command/CommandBuilderInterface.php
@@ -14,7 +14,8 @@ interface CommandBuilderInterface
 {
     /**
      * Build and return command
+     * @param bool $legacy set 'true' to use v2.0.7 CasparCG version
      * @return string
      */
-    public function build(): string;
+    public function build(bool $legacy = false): string;
 }
diff --git a/src/Command/Mixer/Builder/AnchorBuilder.php b/src/Command/Mixer/Builder/AnchorBuilder.php
index b58897c..bf17543 100644
--- a/src/Command/Mixer/Builder/AnchorBuilder.php
+++ b/src/Command/Mixer/Builder/AnchorBuilder.php
@@ -65,13 +65,13 @@ protected function buildCoordinates(): string
         $parts = [$this->x, $this->y];
         array_filter($parts);
 
-        return join(' ', $parts);
+        return implode(' ', $parts);
     }
 
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $channelAndLayer = $this->buildChannel();
         $coordinates     = $this->buildCoordinates();
diff --git a/src/Command/Mixer/Builder/BlendBuilder.php b/src/Command/Mixer/Builder/BlendBuilder.php
index dddc87a..08ee7a7 100644
--- a/src/Command/Mixer/Builder/BlendBuilder.php
+++ b/src/Command/Mixer/Builder/BlendBuilder.php
@@ -74,7 +74,7 @@ public function blendMode(string $mode): BlendBuilder
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $channelAndLayer = $this->buildChannel();
 
diff --git a/src/Command/Mixer/Builder/BrightnessBuilder.php b/src/Command/Mixer/Builder/BrightnessBuilder.php
index fcde8e5..05432f9 100644
--- a/src/Command/Mixer/Builder/BrightnessBuilder.php
+++ b/src/Command/Mixer/Builder/BrightnessBuilder.php
@@ -85,7 +85,7 @@ public function animation(string $type): BrightnessBuilder
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $channelAndLayer = $this->buildChannel();
 
diff --git a/src/Command/Mixer/Builder/ChromaBuilder.php b/src/Command/Mixer/Builder/ChromaBuilder.php
index 15d58d1..b517d38 100644
--- a/src/Command/Mixer/Builder/ChromaBuilder.php
+++ b/src/Command/Mixer/Builder/ChromaBuilder.php
@@ -77,7 +77,7 @@ protected function buildTresholds(): string
 
     #endregion
 
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $channelAndLayer = $this->buildChannel();
 
diff --git a/src/Command/Mixer/Builder/ClearBuilder.php b/src/Command/Mixer/Builder/ClearBuilder.php
index f8f3459..21e65aa 100644
--- a/src/Command/Mixer/Builder/ClearBuilder.php
+++ b/src/Command/Mixer/Builder/ClearBuilder.php
@@ -19,7 +19,7 @@ class ClearBuilder extends BaseBuilder
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $channelAndLayer = $this->buildChannel();
 
diff --git a/src/Command/Mixer/Builder/ClipBuilder.php b/src/Command/Mixer/Builder/ClipBuilder.php
index 2bdd623..05be0fa 100644
--- a/src/Command/Mixer/Builder/ClipBuilder.php
+++ b/src/Command/Mixer/Builder/ClipBuilder.php
@@ -131,7 +131,7 @@ protected function buildCoordinates(): string
         $parts = [$this->x, $this->y];
         array_filter($parts);
 
-        return join(' ', $parts);
+        return implode(' ', $parts);
     }
 
     /**
@@ -142,13 +142,13 @@ protected function buildSize(): string
         $parts = [$this->width, $this->height];
         array_filter($parts);
 
-        return join(' ', $parts);
+        return implode(' ', $parts);
     }
 
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $channelAndLayer = $this->buildChannel();
         $coordinates     = $this->buildCoordinates();
@@ -156,7 +156,7 @@ public function build(): string
 
         $tail = '';
 
-        if (strlen($coordinates) && strlen($size)) {
+        if ('' !== $coordinates && '' !== $size) {
             $tail = "$coordinates $size {$this->duration} {$this->animation}";
         }
 
diff --git a/src/Command/Mixer/Builder/ContrastBuilder.php b/src/Command/Mixer/Builder/ContrastBuilder.php
index 90002ec..f3cb931 100644
--- a/src/Command/Mixer/Builder/ContrastBuilder.php
+++ b/src/Command/Mixer/Builder/ContrastBuilder.php
@@ -85,7 +85,7 @@ public function animation(string $type): ContrastBuilder
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $channelAndLayer = $this->buildChannel();
 
diff --git a/src/Command/Mixer/Builder/CropBuilder.php b/src/Command/Mixer/Builder/CropBuilder.php
index 76a3a16..65fd252 100644
--- a/src/Command/Mixer/Builder/CropBuilder.php
+++ b/src/Command/Mixer/Builder/CropBuilder.php
@@ -130,7 +130,7 @@ protected function buildLeftTop(): string
         $parts = [$this->xLeft, $this->yTop];
         array_filter($parts);
 
-        return join(' ', $parts);
+        return implode(' ', $parts);
     }
 
     /**
@@ -141,13 +141,13 @@ protected function buildRightBottom(): string
         $parts = [$this->xRight, $this->yBottom];
         array_filter($parts);
 
-        return join(' ', $parts);
+        return implode(' ', $parts);
     }
 
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $channelAndLayer = $this->buildChannel();
         $leftTop         = $this->buildLeftTop();
@@ -155,7 +155,7 @@ public function build(): string
 
         $tail = '';
 
-        if (strlen($leftTop) && strlen($rightBottom)) {
+        if ('' !== $leftTop && '' !== $rightBottom) {
             $tail = "$leftTop $rightBottom {$this->duration} {$this->animation}";
         }
 
diff --git a/src/Command/Mixer/Builder/FillBuilder.php b/src/Command/Mixer/Builder/FillBuilder.php
index 17414de..7cd5d74 100644
--- a/src/Command/Mixer/Builder/FillBuilder.php
+++ b/src/Command/Mixer/Builder/FillBuilder.php
@@ -131,7 +131,7 @@ protected function buildCoordinates(): string
         $parts = [$this->x, $this->y];
         array_filter($parts);
 
-        return join(' ', $parts);
+        return implode(' ', $parts);
     }
 
     /**
@@ -142,13 +142,13 @@ protected function buildSize(): string
         $parts = [$this->width, $this->height];
         array_filter($parts);
 
-        return join(' ', $parts);
+        return implode(' ', $parts);
     }
 
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $channelAndLayer = $this->buildChannel();
         $coordinates     = $this->buildCoordinates();
@@ -156,7 +156,7 @@ public function build(): string
 
         $tail = '';
 
-        if (strlen($coordinates) && strlen($size)) {
+        if ('' !== $coordinates && '' !== $size) {
             $tail = "$coordinates $size {$this->duration} {$this->animation}";
         }
 
diff --git a/src/Command/Mixer/Builder/GridBuilder.php b/src/Command/Mixer/Builder/GridBuilder.php
index 36726f0..ba1b483 100644
--- a/src/Command/Mixer/Builder/GridBuilder.php
+++ b/src/Command/Mixer/Builder/GridBuilder.php
@@ -111,7 +111,7 @@ protected function buildChannel(): string
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $channel = $this->buildChannel();
 
diff --git a/src/Command/Mixer/Builder/KeyerBuilder.php b/src/Command/Mixer/Builder/KeyerBuilder.php
index 1314097..9602e3e 100644
--- a/src/Command/Mixer/Builder/KeyerBuilder.php
+++ b/src/Command/Mixer/Builder/KeyerBuilder.php
@@ -42,7 +42,7 @@ public function keyerDisabled(): KeyerBuilder
     /**
      * @inheritdoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $chanelAndLayer = $this->buildChannel();
         $keyer          = $this->keyer ? 1 : 0;
diff --git a/src/Command/Mixer/Builder/LevelsBuilder.php b/src/Command/Mixer/Builder/LevelsBuilder.php
index 1b60e63..d45762d 100644
--- a/src/Command/Mixer/Builder/LevelsBuilder.php
+++ b/src/Command/Mixer/Builder/LevelsBuilder.php
@@ -62,7 +62,7 @@ public function input(float $min, float $max): LevelsBuilder
         $this->validateValueRange($max);
 
         $this->minInput = $min;
-        $this->minInput = $max;
+        $this->maxInput = $max;
 
         return $this;
     }
@@ -165,7 +165,7 @@ protected function buildLevelParams(): string
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $channelAndLayer = $this->buildChannel();
         $levelParamStr   = $this->buildLevelParams();
diff --git a/src/Command/Mixer/Builder/MasterVolumeBuilder.php b/src/Command/Mixer/Builder/MasterVolumeBuilder.php
index 36792da..85df1a5 100644
--- a/src/Command/Mixer/Builder/MasterVolumeBuilder.php
+++ b/src/Command/Mixer/Builder/MasterVolumeBuilder.php
@@ -76,7 +76,7 @@ protected function buildChannel(): string
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $channel = $this->buildChannel();
 
diff --git a/src/Command/Mixer/Builder/OpacityBuilder.php b/src/Command/Mixer/Builder/OpacityBuilder.php
index 443350d..a66b8ea 100644
--- a/src/Command/Mixer/Builder/OpacityBuilder.php
+++ b/src/Command/Mixer/Builder/OpacityBuilder.php
@@ -75,7 +75,7 @@ public function animation(string $type): OpacityBuilder
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $channelAndLayer = $this->buildChannel();
 
diff --git a/src/Command/Mixer/Builder/PerspectiveBuilder.php b/src/Command/Mixer/Builder/PerspectiveBuilder.php
index 16b9d19..7cb12b8 100644
--- a/src/Command/Mixer/Builder/PerspectiveBuilder.php
+++ b/src/Command/Mixer/Builder/PerspectiveBuilder.php
@@ -134,7 +134,7 @@ protected function toStr($x, $y): string
         $parts = [$x, $y];
         array_filter($parts);
 
-        return join(' ', $parts);
+        return implode(' ', $parts);
     }
 
     /**
@@ -172,7 +172,7 @@ protected function buildBottomLeft(): string
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $channelAndLayer = $this->buildChannel();
         $topLeft         = $this->buildTopLeft();
@@ -182,7 +182,7 @@ public function build(): string
 
         $tail = '';
 
-        if (strlen($topLeft) && strlen($topRight) && strlen($bottomRight) && strlen($bottomLeft)) {
+        if ('' !== $topLeft && '' !== $topRight && '' !== $bottomRight && '' !== $bottomLeft) {
             $tail = "$topLeft $topRight $bottomRight $bottomLeft";
         }
 
diff --git a/src/Command/Mixer/Builder/RotationBuilder.php b/src/Command/Mixer/Builder/RotationBuilder.php
index c1264e8..843a2bc 100644
--- a/src/Command/Mixer/Builder/RotationBuilder.php
+++ b/src/Command/Mixer/Builder/RotationBuilder.php
@@ -36,7 +36,7 @@ public function angle(int $value): RotationBuilder
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $channelAndLayer = $this->buildChannel();
 
diff --git a/src/Command/Mixer/Builder/SaturationBuilder.php b/src/Command/Mixer/Builder/SaturationBuilder.php
index 0342054..e3582c9 100644
--- a/src/Command/Mixer/Builder/SaturationBuilder.php
+++ b/src/Command/Mixer/Builder/SaturationBuilder.php
@@ -85,7 +85,7 @@ public function animation(string $type): SaturationBuilder
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $channelAndLayer = $this->buildChannel();
 
diff --git a/src/Command/Mixer/Builder/StraightAlphaOutputBuilder.php b/src/Command/Mixer/Builder/StraightAlphaOutputBuilder.php
index c0efdf6..a1ada2a 100644
--- a/src/Command/Mixer/Builder/StraightAlphaOutputBuilder.php
+++ b/src/Command/Mixer/Builder/StraightAlphaOutputBuilder.php
@@ -85,15 +85,15 @@ protected function buildActiveState(): string
     {
         if (null === $this->active) {
             return '';
-        } else {
-            return $this->active ? '1' : '0';
         }
+
+        return $this->active ? '1' : '0';
     }
 
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $channel     = $this->buildChannel();
         $activeState = $this->buildActiveState();
diff --git a/src/Command/Mixer/Builder/VolumeBuilder.php b/src/Command/Mixer/Builder/VolumeBuilder.php
index 60af529..b6ca9f2 100644
--- a/src/Command/Mixer/Builder/VolumeBuilder.php
+++ b/src/Command/Mixer/Builder/VolumeBuilder.php
@@ -85,7 +85,7 @@ public function animation(string $type): VolumeBuilder
     /**
      * @inheritDoc
      */
-    public function build(): string
+    public function build(bool $legacy = false): string
     {
         $channelAndLayer = $this->buildChannel();
 
diff --git a/src/OSC/Converter.php b/src/OSC/Converter.php
index 5ac75fb..812e8f9 100644
--- a/src/OSC/Converter.php
+++ b/src/OSC/Converter.php
@@ -78,7 +78,7 @@ public static function string(string $bin): string
 
     public static function char(string $bin): string
     {
-        $res = unpack('cval', substr($bin, 0, 1));
+        $res = unpack('cval', $bin[0]);
 
         return $res['val'];
     }
diff --git a/src/OSC/Message/Channel.php b/src/OSC/Message/Channel.php
index 6b7f713..98b5a4d 100644
--- a/src/OSC/Message/Channel.php
+++ b/src/OSC/Message/Channel.php
@@ -38,7 +38,7 @@ public static function create(RawMessage $message)
     /**
      * @return int|null
      */
-    public function getChannel(): ?int
+    public function getChannel()
     {
         return $this->channel;
     }
diff --git a/src/OSC/Message/Channel/Format.php b/src/OSC/Message/Channel/Format.php
index 2cf58a2..e7c354f 100644
--- a/src/OSC/Message/Channel/Format.php
+++ b/src/OSC/Message/Channel/Format.php
@@ -33,7 +33,7 @@ public function parseArguments(RawMessage $message)
     /**
      * @return string|null
      */
-    public function getValue(): ?string
+    public function getValue()
     {
         return $this->value;
     }
diff --git a/src/OSC/Message/Channel/OutputFrameType.php b/src/OSC/Message/Channel/OutputFrameType.php
index b2e76f4..9026367 100644
--- a/src/OSC/Message/Channel/OutputFrameType.php
+++ b/src/OSC/Message/Channel/OutputFrameType.php
@@ -31,7 +31,7 @@ public function parseArguments(RawMessage $message)
     /**
      * @return string|null
      */
-    public function getValue(): ?string
+    public function getValue()
     {
         return $this->value;
     }
diff --git a/src/OSC/Message/Channel/OutputPort.php b/src/OSC/Message/Channel/OutputPort.php
index c9c406d..542cbe0 100644
--- a/src/OSC/Message/Channel/OutputPort.php
+++ b/src/OSC/Message/Channel/OutputPort.php
@@ -40,7 +40,7 @@ public static function create(RawMessage $message)
     /**
      * @return int|null
      */
-    public function getPort(): ?int
+    public function getPort()
     {
         return $this->port;
     }
diff --git a/src/OSC/Message/Channel/OutputPortFrame.php b/src/OSC/Message/Channel/OutputPortFrame.php
index 92fde1d..1658788 100644
--- a/src/OSC/Message/Channel/OutputPortFrame.php
+++ b/src/OSC/Message/Channel/OutputPortFrame.php
@@ -36,7 +36,7 @@ public function parseArguments(RawMessage $message)
      *
      * @return int|null
      */
-    public function getCurrentFrames(): ?int
+    public function getCurrentFrames()
     {
         return $this->currentFrames;
     }
@@ -46,7 +46,7 @@ public function getCurrentFrames(): ?int
      *
      * @return int|null
      */
-    public function getMaxFrames(): ?int
+    public function getMaxFrames()
     {
         return $this->maxFrames;
     }
diff --git a/src/OSC/Message/Channel/ProfilerTime.php b/src/OSC/Message/Channel/ProfilerTime.php
index d35f5c7..39ffe10 100644
--- a/src/OSC/Message/Channel/ProfilerTime.php
+++ b/src/OSC/Message/Channel/ProfilerTime.php
@@ -35,7 +35,7 @@ public function parseArguments(RawMessage $message)
     /**
      * @return float|null
      */
-    public function getActual(): ?float
+    public function getActual()
     {
         return $this->actual;
     }
@@ -43,7 +43,7 @@ public function getActual(): ?float
     /**
      * @return float|null
      */
-    public function getExpected(): ?float
+    public function getExpected()
     {
         return $this->expected;
     }
diff --git a/src/OSC/Message/Mixer/AudioDbFS.php b/src/OSC/Message/Mixer/AudioDbFS.php
index f64c7a5..0b99cee 100644
--- a/src/OSC/Message/Mixer/AudioDbFS.php
+++ b/src/OSC/Message/Mixer/AudioDbFS.php
@@ -63,7 +63,7 @@ public function setNbChannel(int $nbChannel)
      *
      * @return int|null
      */
-    public function getNbChannel(): ?int
+    public function getNbChannel()
     {
         return $this->nbChannel;
     }
@@ -73,7 +73,7 @@ public function getNbChannel(): ?int
      *
      * @return float|null
      */
-    public function getLevel(): ?float
+    public function getLevel()
     {
         return $this->level;
     }
diff --git a/src/OSC/Message/Mixer/AudioNbChannels.php b/src/OSC/Message/Mixer/AudioNbChannels.php
index d5b0970..bcba95b 100644
--- a/src/OSC/Message/Mixer/AudioNbChannels.php
+++ b/src/OSC/Message/Mixer/AudioNbChannels.php
@@ -34,7 +34,7 @@ public function parseArguments(RawMessage $message)
      *
      * @return int|null
      */
-    public function getValue(): ?int
+    public function getValue()
     {
         return $this->value;
     }
diff --git a/src/OSC/Message/Producer/FFmpeg/AudioChannels.php b/src/OSC/Message/Producer/FFmpeg/AudioChannels.php
index f4f2927..29facc4 100644
--- a/src/OSC/Message/Producer/FFmpeg/AudioChannels.php
+++ b/src/OSC/Message/Producer/FFmpeg/AudioChannels.php
@@ -34,7 +34,7 @@ public function parseArguments(RawMessage $message)
      *
      * @return int|null
      */
-    public function getValue(): ?int
+    public function getValue()
     {
         return $this->value;
     }
diff --git a/src/OSC/Message/Producer/FFmpeg/AudioCodec.php b/src/OSC/Message/Producer/FFmpeg/AudioCodec.php
index 6d3a2cf..a47cf34 100644
--- a/src/OSC/Message/Producer/FFmpeg/AudioCodec.php
+++ b/src/OSC/Message/Producer/FFmpeg/AudioCodec.php
@@ -34,7 +34,7 @@ public function parseArguments(RawMessage $message)
      *
      * @return string|null
      */
-    public function getValue(): ?string
+    public function getValue()
     {
         return $this->value;
     }
diff --git a/src/OSC/Message/Producer/FFmpeg/AudioFormat.php b/src/OSC/Message/Producer/FFmpeg/AudioFormat.php
index 7fd6d40..c3a2e83 100644
--- a/src/OSC/Message/Producer/FFmpeg/AudioFormat.php
+++ b/src/OSC/Message/Producer/FFmpeg/AudioFormat.php
@@ -34,7 +34,7 @@ public function parseArguments(RawMessage $message)
      *
      * @return string|null
      */
-    public function getValue(): ?string
+    public function getValue()
     {
         return $this->value;
     }
diff --git a/src/OSC/Message/Producer/FFmpeg/AudioSampleRate.php b/src/OSC/Message/Producer/FFmpeg/AudioSampleRate.php
index 56efead..ab8d7dd 100644
--- a/src/OSC/Message/Producer/FFmpeg/AudioSampleRate.php
+++ b/src/OSC/Message/Producer/FFmpeg/AudioSampleRate.php
@@ -34,7 +34,7 @@ public function parseArguments(RawMessage $message)
      *
      * @return int|null
      */
-    public function getValue(): ?int
+    public function getValue()
     {
         return $this->value;
     }
diff --git a/src/OSC/Message/Producer/FFmpeg/Fps.php b/src/OSC/Message/Producer/FFmpeg/Fps.php
index d77c2d3..ce84208 100644
--- a/src/OSC/Message/Producer/FFmpeg/Fps.php
+++ b/src/OSC/Message/Producer/FFmpeg/Fps.php
@@ -34,7 +34,7 @@ public function parseArguments(RawMessage $message)
      *
      * @return float|null
      */
-    public function getValue(): ?float
+    public function getValue()
     {
         return $this->value;
     }
diff --git a/src/OSC/Message/Producer/FFmpeg/Frame.php b/src/OSC/Message/Producer/FFmpeg/Frame.php
index 38a876c..b635298 100644
--- a/src/OSC/Message/Producer/FFmpeg/Frame.php
+++ b/src/OSC/Message/Producer/FFmpeg/Frame.php
@@ -37,7 +37,7 @@ public function parseArguments(RawMessage $message)
      *
      * @return int|null
      */
-    public function getElapsed(): ?int
+    public function getElapsed()
     {
         return $this->elapsed;
     }
@@ -47,7 +47,7 @@ public function getElapsed(): ?int
      *
      * @return int|null
      */
-    public function getTotal(): ?int
+    public function getTotal()
     {
         return $this->total;
     }
diff --git a/src/OSC/Message/Producer/FFmpeg/Loop.php b/src/OSC/Message/Producer/FFmpeg/Loop.php
index 5c6b325..b079477 100644
--- a/src/OSC/Message/Producer/FFmpeg/Loop.php
+++ b/src/OSC/Message/Producer/FFmpeg/Loop.php
@@ -34,7 +34,7 @@ public function parseArguments(RawMessage $message)
      *
      * @return bool|null
      */
-    public function getValue(): ?bool
+    public function getValue()
     {
         return $this->value;
     }
diff --git a/src/OSC/Message/Producer/FFmpeg/Path.php b/src/OSC/Message/Producer/FFmpeg/Path.php
index 64524e8..ec6e133 100644
--- a/src/OSC/Message/Producer/FFmpeg/Path.php
+++ b/src/OSC/Message/Producer/FFmpeg/Path.php
@@ -34,7 +34,7 @@ public function parseArguments(RawMessage $message)
      *
      * @return string|null
      */
-    public function getValue(): ?string
+    public function getValue()
     {
         return $this->value;
     }
diff --git a/src/OSC/Message/Producer/FFmpeg/Time.php b/src/OSC/Message/Producer/FFmpeg/Time.php
index 77d42da..72c7f78 100644
--- a/src/OSC/Message/Producer/FFmpeg/Time.php
+++ b/src/OSC/Message/Producer/FFmpeg/Time.php
@@ -37,7 +37,7 @@ public function parseArguments(RawMessage $message)
      *
      * @return float
      */
-    public function getElapsed(): ?float
+    public function getElapsed()
     {
         return $this->elapsed;
     }
@@ -47,7 +47,7 @@ public function getElapsed(): ?float
      *
      * @return float|null
      */
-    public function getTotal(): ?float
+    public function getTotal()
     {
         return $this->total;
     }
diff --git a/src/OSC/Message/Producer/FFmpeg/VideoCodec.php b/src/OSC/Message/Producer/FFmpeg/VideoCodec.php
index 640c622..9723a1b 100644
--- a/src/OSC/Message/Producer/FFmpeg/VideoCodec.php
+++ b/src/OSC/Message/Producer/FFmpeg/VideoCodec.php
@@ -34,7 +34,7 @@ public function parseArguments(RawMessage $message)
      *
      * @return string|null
      */
-    public function getValue(): ?string
+    public function getValue()
     {
         return $this->value;
     }
diff --git a/src/OSC/Message/Producer/FFmpeg/VideoField.php b/src/OSC/Message/Producer/FFmpeg/VideoField.php
index 6693dc2..07434ba 100644
--- a/src/OSC/Message/Producer/FFmpeg/VideoField.php
+++ b/src/OSC/Message/Producer/FFmpeg/VideoField.php
@@ -34,7 +34,7 @@ public function parseArguments(RawMessage $message)
      *
      * @return string|null
      */
-    public function getValue(): ?string
+    public function getValue()
     {
         return $this->value;
     }
diff --git a/src/OSC/Message/Producer/FFmpeg/VideoHeight.php b/src/OSC/Message/Producer/FFmpeg/VideoHeight.php
index 5b30063..ad7fc2d 100644
--- a/src/OSC/Message/Producer/FFmpeg/VideoHeight.php
+++ b/src/OSC/Message/Producer/FFmpeg/VideoHeight.php
@@ -34,7 +34,7 @@ public function parseArguments(RawMessage $message)
      *
      * @return int|null
      */
-    public function getValue(): ?int
+    public function getValue()
     {
         return $this->value;
     }
diff --git a/src/OSC/Message/Producer/FFmpeg/VideoWidth.php b/src/OSC/Message/Producer/FFmpeg/VideoWidth.php
index a00ad49..9745ae3 100644
--- a/src/OSC/Message/Producer/FFmpeg/VideoWidth.php
+++ b/src/OSC/Message/Producer/FFmpeg/VideoWidth.php
@@ -34,7 +34,7 @@ public function parseArguments(RawMessage $message)
      *
      * @return int|null
      */
-    public function getValue(): ?int
+    public function getValue()
     {
         return $this->value;
     }
diff --git a/src/OSC/Message/Stage.php b/src/OSC/Message/Stage.php
index d26b2ad..05c9c82 100644
--- a/src/OSC/Message/Stage.php
+++ b/src/OSC/Message/Stage.php
@@ -41,7 +41,7 @@ public static function create(RawMessage $message)
      *
      * @return int|null
      */
-    public function getLayer(): ?int
+    public function getLayer()
     {
         return $this->layer;
     }
diff --git a/src/OSC/Message/Stage/BackgroundType.php b/src/OSC/Message/Stage/BackgroundType.php
index 6000169..70101b1 100644
--- a/src/OSC/Message/Stage/BackgroundType.php
+++ b/src/OSC/Message/Stage/BackgroundType.php
@@ -31,7 +31,7 @@ public function parseArguments(RawMessage $message)
     /**
      * @return string|null
      */
-    public function getValue(): ?string
+    public function getValue()
     {
         return $this->value;
     }
diff --git a/src/OSC/Message/Stage/Frame.php b/src/OSC/Message/Stage/Frame.php
index 28e4d14..7678866 100644
--- a/src/OSC/Message/Stage/Frame.php
+++ b/src/OSC/Message/Stage/Frame.php
@@ -34,7 +34,7 @@ public function parseArguments(RawMessage $message)
      *
      * @return int|null
      */
-    public function getValue(): ?int
+    public function getValue()
     {
         return $this->value;
     }
diff --git a/src/OSC/Message/Stage/Paused.php b/src/OSC/Message/Stage/Paused.php
index 602ff63..767f338 100644
--- a/src/OSC/Message/Stage/Paused.php
+++ b/src/OSC/Message/Stage/Paused.php
@@ -34,7 +34,7 @@ public function parseArguments(RawMessage $message)
      *
      * @return bool|null
      */
-    public function isValue(): ?bool
+    public function isValue()
     {
         return $this->value;
     }
diff --git a/src/OSC/Message/Stage/ProfilerTime.php b/src/OSC/Message/Stage/ProfilerTime.php
index f7a9b55..4e37c6f 100644
--- a/src/OSC/Message/Stage/ProfilerTime.php
+++ b/src/OSC/Message/Stage/ProfilerTime.php
@@ -37,7 +37,7 @@ public function parseArguments(RawMessage $message)
      *
      * @return float|null
      */
-    public function getActual(): ?float
+    public function getActual()
     {
         return $this->actual;
     }
@@ -47,7 +47,7 @@ public function getActual(): ?float
      *
      * @return float|null
      */
-    public function getExpected(): ?float
+    public function getExpected()
     {
         return $this->expected;
     }
diff --git a/src/OSC/Message/Stage/Time.php b/src/OSC/Message/Stage/Time.php
index f6bf78e..c4dc149 100644
--- a/src/OSC/Message/Stage/Time.php
+++ b/src/OSC/Message/Stage/Time.php
@@ -34,7 +34,7 @@ public function parseArguments(RawMessage $message)
      *
      * @return float|null
      */
-    public function getValue(): ?float
+    public function getValue()
     {
         return $this->value;
     }
diff --git a/src/OSC/Message/Stage/Type.php b/src/OSC/Message/Stage/Type.php
index 436c4b7..a10fe90 100644
--- a/src/OSC/Message/Stage/Type.php
+++ b/src/OSC/Message/Stage/Type.php
@@ -34,7 +34,7 @@ public function parseArguments(RawMessage $message)
      *
      * @return string|null
      */
-    public function getValue(): ?string
+    public function getValue()
     {
         return $this->value;
     }