Decompile speakersSetMode

src/include/constants.h

@@ -3450,6 +3450,11 @@
 #define SPAWNFLAG_RTRACKED            0x00008000
 #define SPAWNFLAG_BLUESIGHT           0x00010000
 
+#define SPEAKERMODE_MONO      1
+#define SPEAKERMODE_STEREO    2
+#define SPEAKERMODE_HEADPHONE 3
+#define SPEAKERMODE_SURROUND  4
+
 #define SPECIALDIE_NONE        0
 #define SPECIALDIE_FALLBACK    1
 #define SPECIALDIE_ROLL1       2

src/include/lib/speaker.h

@@ -4,7 +4,7 @@
 #include "data.h"
 #include "types.h"
 
-void speaker00034030(s32 arg0);
+void speakersSetMode(u8 mode);
 void speaker00034104(s32 index, s32 arg1);
 
 #endif

src/include/types.h

@@ -7053,10 +7053,9 @@ struct mp3vars {
 };
 
 struct var8009c340 {
-	u8 unk00;
-	u8 unk01;
-	u8 unk02;
-	u8 unk03;
+	u8 surround;
+	u8 mono;
+	u8 headphone;
 };
 
 struct var80095210 {