Documentation update

docs/design/delaylines.md

@@ -8,19 +8,43 @@
                 └─[FBOut A/B]────[To feedback]
 ```
 
-## Effects layout
-
-```
-                   
-[Input A]──╔═══════╗           [LFO ×4]                ╔═════╗
-           ║Routing║───────────[DelayLineA/B]──────────║Mixer║─────[Output A/B]
-[Input B]──╚═══════╝     FBOut└(Taps ×4)               ╚═════╝
-                                                      (IIR ×4)
-```
-
 ## Effects properties
 
 * 2 inputs and outputs
-* 4 LFOs assignable to position and level
 * 2 Delay lines, with each having 4 taps with a 16 element FIR line
-* A mixer with 4×2 IIR filters for equalization
+* A mixer with 4×2 IIR filters for equalization
+
+## MIDI control change layout
+
+Control change is mainly done on channels 
+
+### Taps
+
+MSB 0 through 7 in the unregistered namespace represent each taps.
+
+* LSB 0 through 15 set the FIR levels.
+* LSB 16 through 19 are output Levels, including feedback (LRAB).
+* LSB 20 sets the position of the tap.
+* LSB 21 disables the tap. (Might result in performance gain).
+* LSB 22 disables the FIR. (Might result in performance gain).
+
+MSB 9 has all the EQ. Upper 3 bits of the LSB select the EQ, lower two bits set the given parameters:
+
+* 0 sets the level between -0.5 and 1.0.
+* 1 sets the mid frequency between 0 and 20 000 Hz.
+* 2 sets the Q value (filter bandwidth).
+
+MSB 10 contain the master values:
+
+* LSB 0 through 3 set the input levels from various inputs of the module into the delay lines.
+* LSB 4 through 5 set the master output levels.
+
+# Module config parameters
+
+DelayLines needs to be set up with two extra parameters in the audio config file, something like this:
+
+```s
+module "delaylines" "audiofx" 4096 4096
+```
+
+The 3rd and the 4th parameters set the length of the delay lines, and must be powers of two.

docs/design/fm_synth.md

@@ -349,6 +349,33 @@ The synth shares two LFOs (tremolo and vibrato) and four filters between channel
 * `HPFBFreq` [15]: Sets the high-pass filter frequency for the Aux B channel (0-20 000Hz)
 * `Ringmod` [16]: Enables ring modulation, by setting the tremolo frequency into audible territory and bypassing the aliasing filter.
 
+# Special SysEx commands
+
+## 7 Bit command 0x20
+
+Layout:
+
+`20 WF TY [...]`
+
+`WF` choses the waveform to be set, `TY` sets the type of the waveform.
+
+* 0x50 creates a pulse wave. It is followed by two bytes, which set the pulse-width of the wave.
+* 0x54 creates a triangular wave. It is followed by two bytes, which set the sigma of the wave.
+* 0x74 creates an integrated triangular wave. It is followed by two bytes, which set the sigma of the wave.
+* 0x53 creates a sine wave. It is followed by four bytes, each which set a quadrant of the sine wave.
+
+Sine wave quadrants can be defined with the following bits:
+
+* bit 0 = If set, then the sine fragment is present. If not, this portion will be replaced with all zeros instead.
+* bit 1-2 = Doubling mode:
+* * 0 = No doubling.
+* * 1 = Same cycle twice.
+* * 2 = Same cycle mirrored, effectively putting a half-sine into a quarter with the right settings.
+* * 3 = The second half is all zeros, the sine fragment is effectively "stuffed" into an eight of the waveform.
+* bit 3 = Horizontal mirroring of the cycle.
+* bit 4 = Vertical mirroring of the cycle.
+* bit 5 = Modifies the curve of the sinewave for a bit more square-ish shape.
+
 # Setting guidelines
 
 * Small amounts of release times can function as a pop filter.