diff --git a/app/app.go b/app/app.go
index 7236c52..d2ba38f 100644
--- a/app/app.go
+++ b/app/app.go
@@ -77,7 +77,6 @@ var ConfigFormat = ConfigTemplate{
 
 type App struct {
 	*Printer
-	Config  map[string]extractor.Config
 	Hashes  map[stingray.Hash]string
 	gameDir string
 	dataDir *stingray.DataDir
@@ -242,7 +241,7 @@ func (a *App) MatchingFiles(includeGlob, excludeGlob string, cfgTemplate ConfigT
 	return res, nil
 }
 
-func (a *App) ExtractFile(id stingray.FileID, outDir string, runner *exec.Runner) error {
+func (a *App) ExtractFile(id stingray.FileID, outDir string, extrCfg map[string]extractor.Config, runner *exec.Runner) error {
 	name, ok := a.Hashes[id.Name]
 	if !ok {
 		name = id.Name.String()
@@ -257,7 +256,7 @@ func (a *App) ExtractFile(id stingray.FileID, outDir string, runner *exec.Runner
 		return fmt.Errorf("extract %v.%v: file does not found", name, typ)
 	}
 
-	cfg := a.Config[typ]
+	cfg := extrCfg[typ]
 	if cfg == nil {
 		cfg = make(extractor.Config)
 	}
diff --git a/extractor/wwise/extractor.go b/extractor/wwise/extractor.go
index 753a3fb..be4ccc3 100644
--- a/extractor/wwise/extractor.go
+++ b/extractor/wwise/extractor.go
@@ -127,6 +127,10 @@ func convertWemStream(outPath string, in io.ReadSeeker, format format, runner *e
 			}
 		}
 	default:
+		if format == formatAac && !dec.ChannelLayout().HasName() {
+			// AAC doesn't support custom layouts
+			format = formatOgg
+		}
 		var fmtExt string
 		switch format {
 		case formatMp3:
@@ -143,7 +147,7 @@ func convertWemStream(outPath string, in io.ReadSeeker, format format, runner *e
 			"-f", "f32le",
 			"-ar", fmt.Sprint(dec.SampleRate()),
 			"-ac", fmt.Sprint(dec.Channels()),
-			"-channel_layout", dec.ChannelLayout().String(),
+			"-channel_layout", fmt.Sprintf("0x%x", uint32(dec.ChannelLayout())),
 			"-i", "pipe:",
 			outPath+fmtExt,
 		); err != nil {
diff --git a/hash_tool/main.go b/hash_tool/main.go
index 49d3987..eebd8cb 100644
--- a/hash_tool/main.go
+++ b/hash_tool/main.go
@@ -192,7 +192,7 @@ func main() {
 		}
 
 		if *maxWords != -1 {
-			fmt.Fprintln(os.Stderr, "brute_force_length only available for \"crack\" mode")
+			fmt.Fprintln(os.Stderr, "max_words only available for \"crack\" mode")
 			os.Exit(1)
 		}
 
diff --git a/main.go b/main.go
index ef90833..9539e14 100644
--- a/main.go
+++ b/main.go
@@ -161,7 +161,7 @@ extractor config:
 				truncName = "..." + truncName[len(truncName)-37:]
 			}
 			prt.Statusf("File %v/%v: %v", i+1, len(files), truncName)
-			if err := a.ExtractFile(id, *outDir, runner); err == nil {
+			if err := a.ExtractFile(id, *outDir, extrCfg, runner); err == nil {
 				numExtrFiles++
 			} else {
 				prt.Errorf("%v", err)
diff --git a/wwise/wem.go b/wwise/wem.go
index b839c66..a0c1b80 100644
--- a/wwise/wem.go
+++ b/wwise/wem.go
@@ -232,6 +232,50 @@ const (
 	SpeakerTBR                         // top back left
 )
 
+// Returns ffmpeg-compatible string for a single speaker flag (e.g. "FL").
+func (sp SpeakerFlag) String() string {
+	switch sp {
+	case SpeakerFL:
+		return "FL"
+	case SpeakerFR:
+		return "FR"
+	case SpeakerFC:
+		return "FC"
+	case SpeakerLFE:
+		return "LFE"
+	case SpeakerBL:
+		return "BL"
+	case SpeakerBR:
+		return "BR"
+	case SpeakerFLC:
+		return "FLC"
+	case SpeakerFRC:
+		return "FRC"
+	case SpeakerBC:
+		return "BC"
+	case SpeakerSL:
+		return "SL"
+	case SpeakerSR:
+		return "SR"
+	case SpeakerTC:
+		return "TC"
+	case SpeakerTFL:
+		return "TFL"
+	case SpeakerTFC:
+		return "TFC"
+	case SpeakerTFR:
+		return "TFR"
+	case SpeakerTBL:
+		return "TBL"
+	case SpeakerTBC:
+		return "TBC"
+	case SpeakerTBR:
+		return "TBR"
+	default:
+		panic(fmt.Sprintf("unhandled case: 0b%032b", uint32(sp)))
+	}
+}
+
 type ChannelLayout uint32
 
 const (
@@ -263,9 +307,40 @@ const (
 	Mapping7Point1Top      = ChannelLayout(SpeakerFL | SpeakerFR | SpeakerFC | SpeakerLFE | SpeakerBL | SpeakerBR | SpeakerTFL | SpeakerTFR)
 )
 
-// Returns FFmpeg-compatible name.
-func (cm ChannelLayout) String() string {
-	switch cm {
+// Returns true if the channel layout can be described by a simple name like "7.1" or "stereo".
+// The string can be obtained by calling String().
+func (cl ChannelLayout) HasName() bool {
+	return cl == MappingMono ||
+		cl == MappingStereo ||
+		cl == Mapping2Point1 ||
+		cl == Mapping3Point0 ||
+		cl == Mapping3Point0Back ||
+		cl == Mapping4Point0 ||
+		cl == MappingQuad ||
+		cl == MappingQuadSide ||
+		cl == Mapping3Point1 ||
+		cl == Mapping5Point0 ||
+		cl == Mapping5Point0Side ||
+		cl == Mapping4Point1 ||
+		cl == Mapping5Point1 ||
+		cl == Mapping5Point1Side ||
+		cl == Mapping6Point0 ||
+		cl == Mapping6Point0Front ||
+		cl == MappingHexagonal ||
+		cl == Mapping6Point1 ||
+		cl == Mapping6Point1Back ||
+		cl == Mapping6Point1Front ||
+		cl == Mapping7Point0 ||
+		cl == Mapping7Point0Front ||
+		cl == Mapping7Point1 ||
+		cl == Mapping7Point1Wide ||
+		cl == Mapping7Point1WideSide ||
+		cl == Mapping7Point1Top
+}
+
+// Returns channel layout name, or, if nonstandard, list of speakers separated by "|".
+func (cl ChannelLayout) String() string {
+	switch cl {
 	case MappingMono:
 		return "mono"
 	case MappingStereo:
@@ -319,7 +394,16 @@ func (cm ChannelLayout) String() string {
 	case Mapping7Point1Top:
 		return "7.1(top)"
 	default:
-		panic(fmt.Sprintf("unhandled case: 0x%032b", uint32(cm)))
+		var res string
+		for i := 0; i < 64; i++ {
+			if (cl>>i)&1 != 0 {
+				if len(res) != 0 {
+					res += "|"
+				}
+				res += SpeakerFlag(1 << i).String()
+			}
+		}
+		return res
 	}
 }