diff --git a/asm/Kyoto/Graphics/CColor.s b/asm/Kyoto/Graphics/CColor.s
index 81564b02..07d2fe42 100644
--- a/asm/Kyoto/Graphics/CColor.s
+++ b/asm/Kyoto/Graphics/CColor.s
@@ -7,69 +7,69 @@ lbl_ctor:
 .section .sbss, "wa"
 .balign 8
 
-.global lbl_805A9568
-lbl_805A9568:
+.global sBlackColor__6CColor
+sBlackColor__6CColor:
 	.skip 0x4
-.global lbl_805A956C
-lbl_805A956C:
+.global sWhiteColor__6CColor
+sWhiteColor__6CColor:
 	.skip 0x4
-.global lbl_805A9570
-lbl_805A9570:
+.global sGreyColor__6CColor
+sGreyColor__6CColor:
 	.skip 0x4
-.global lbl_805A9574
-lbl_805A9574:
+.global sRedColor__6CColor
+sRedColor__6CColor:
 	.skip 0x4
-.global lbl_805A9578
-lbl_805A9578:
+.global sGreenColor__6CColor
+sGreenColor__6CColor:
 	.skip 0x4
-.global lbl_805A957C
-lbl_805A957C:
+.global sBlueColor__6CColor
+sBlueColor__6CColor:
 	.skip 0x4
-.global lbl_805A9580
-lbl_805A9580:
+.global sYellowColor__6CColor
+sYellowColor__6CColor:
 	.skip 0x4
-.global lbl_805A9584
-lbl_805A9584:
+.global sPurpleColor__6CColor
+sPurpleColor__6CColor:
 	.skip 0x4
-.global lbl_805A9588
-lbl_805A9588:
+.global sOrangeColor__6CColor
+sOrangeColor__6CColor:
 	.skip 0x8
 
 .section .text, "ax"
 
 .global Orange__6CColorFv
 Orange__6CColorFv:
-/* 80349F84 00346EE4  38 6D A9 C8 */	addi r3, r13, lbl_805A9588@sda21
+/* 80349F84 00346EE4  38 6D A9 C8 */	addi r3, r13, sOrangeColor__6CColor@sda21
 /* 80349F88 00346EE8  4E 80 00 20 */	blr
 
 .global Yellow__6CColorFv
 Yellow__6CColorFv:
-/* 80349F8C 00346EEC  38 6D A9 C0 */	addi r3, r13, lbl_805A9580@sda21
+/* 80349F8C 00346EEC  38 6D A9 C0 */	addi r3, r13, sYellowColor__6CColor@sda21
 /* 80349F90 00346EF0  4E 80 00 20 */	blr
 
 .global Blue__6CColorFv
 Blue__6CColorFv:
-/* 80349F94 00346EF4  38 6D A9 BC */	addi r3, r13, lbl_805A957C@sda21
+/* 80349F94 00346EF4  38 6D A9 BC */	addi r3, r13, sBlueColor__6CColor@sda21
 /* 80349F98 00346EF8  4E 80 00 20 */	blr
 
 .global Red__6CColorFv
 Red__6CColorFv:
-/* 80349F9C 00346EFC  38 6D A9 B4 */	addi r3, r13, lbl_805A9574@sda21
+/* 80349F9C 00346EFC  38 6D A9 B4 */	addi r3, r13, sRedColor__6CColor@sda21
 /* 80349FA0 00346F00  4E 80 00 20 */	blr
 
 .global Grey__6CColorFv
 Grey__6CColorFv:
-/* 80349FA4 00346F04  38 6D A9 B0 */	addi r3, r13, lbl_805A9570@sda21
+/* 80349FA4 00346F04  38 6D A9 B0 */	addi r3, r13, sGreyColor__6CColor@sda21
 /* 80349FA8 00346F08  4E 80 00 20 */	blr
 
 .global White__6CColorFv
 White__6CColorFv:
-/* 80349FAC 00346F0C  38 6D A9 AC */	addi r3, r13, lbl_805A956C@sda21
+/* 80349FAC 00346F0C  38 6D A9 AC */	addi r3, r13, sWhiteColor__6CColor@sda21
 /* 80349FB0 00346F10  4E 80 00 20 */	blr
 
 .global Black__6CColorFv
 Black__6CColorFv:
-/* 80349FB4 00346F14  38 6D A9 A8 */	addi r3, r13, lbl_805A9568@sda21
+/* 80349FB4 00346F14  38 6D A9 A8 */	addi r3, r13, sBlackColor__6CColor@sda21
 /* 80349FB8 00346F18  4E 80 00 20 */	blr
 
 .global __sinit_CColor_cpp
@@ -90,13 +90,13 @@ __sinit_CColor_cpp:
 /* 80349FF0 00346F50  38 03 00 FF */	addi r0, r3, 0xFF7000FF@l
 /* 80349FF4 00346F54  39 40 00 FF */	li r10, 0xff
 /* 80349FF8 00346F58  38 60 FF FF */	li r3, -1
-/* 80349FFC 00346F5C  91 4D A9 A8 */	stw r10, lbl_805A9568@sda21(r13)
-/* 8034A000 00346F60  90 6D A9 AC */	stw r3, lbl_805A956C@sda21(r13)
-/* 8034A004 00346F64  91 2D A9 B0 */	stw r9, lbl_805A9570@sda21(r13)
-/* 8034A008 00346F68  91 0D A9 B4 */	stw r8, lbl_805A9574@sda21(r13)
-/* 8034A00C 00346F6C  90 ED A9 B8 */	stw r7, lbl_805A9578@sda21(r13)
-/* 8034A010 00346F70  90 CD A9 BC */	stw r6, lbl_805A957C@sda21(r13)
-/* 8034A014 00346F74  90 AD A9 C0 */	stw r5, lbl_805A9580@sda21(r13)
-/* 8034A018 00346F78  90 8D A9 C4 */	stw r4, lbl_805A9584@sda21(r13)
-/* 8034A01C 00346F7C  90 0D A9 C8 */	stw r0, lbl_805A9588@sda21(r13)
+/* 80349FFC 00346F5C  91 4D A9 A8 */	stw r10, sBlackColor__6CColor@sda21(r13)
+/* 8034A000 00346F60  90 6D A9 AC */	stw r3, sWhiteColor__6CColor@sda21(r13)
+/* 8034A004 00346F64  91 2D A9 B0 */	stw r9, sGreyColor__6CColor@sda21(r13)
+/* 8034A008 00346F68  91 0D A9 B4 */	stw r8, sRedColor__6CColor@sda21(r13)
+/* 8034A00C 00346F6C  90 ED A9 B8 */	stw r7, sGreenColor__6CColor@sda21(r13)
+/* 8034A010 00346F70  90 CD A9 BC */	stw r6, sBlueColor__6CColor@sda21(r13)
+/* 8034A014 00346F74  90 AD A9 C0 */	stw r5, sYellowColor__6CColor@sda21(r13)
+/* 8034A018 00346F78  90 8D A9 C4 */	stw r4, sPurpleColor__6CColor@sda21(r13)
+/* 8034A01C 00346F7C  90 0D A9 C8 */	stw r0, sOrangeColor__6CColor@sda21(r13)
 /* 8034A020 00346F80  4E 80 00 20 */	blr
diff --git a/asm/musyx/snd_synthapi.s b/asm/musyx/snd_synthapi.s
index 86f34e0c..3db71a7f 100644
--- a/asm/musyx/snd_synthapi.s
+++ b/asm/musyx/snd_synthapi.s
@@ -330,7 +330,7 @@ lbl_8039C5E4:
 /* 8039C608 00399568  4B FF 87 29 */	bl seqGetPrivateId
 /* 8039C60C 0039956C  3C A0 80 55 */	lis r5, synthAuxBCallback@ha
 /* 8039C610 00399570  3C 80 80 55 */	lis r4, synthAuxBUser@ha
-/* 8039C614 00399574  38 CD AE 4C */	addi r6, r13, synthAuxBMidiSet@sda21
+/* 8039C614 00399574  38 CD AE 4C */	addi r6, r13, synthAuxBMIDISet@sda21
 /* 8039C618 00399578  57 00 10 3A */	slwi r0, r24, 2
 /* 8039C61C 0039957C  38 A5 0A 84 */	addi r5, r5, synthAuxBCallback@l
 /* 8039C620 00399580  38 84 0A 64 */	addi r4, r4, synthAuxBUser@l
diff --git a/asm/musyx/synth.s b/asm/musyx/synth.s
index e60417a0..7ae7f6df 100644
--- a/asm/musyx/synth.s
+++ b/asm/musyx/synth.s
@@ -120,8 +120,8 @@ sndActive:
 .global synthJobTableIndex
 synthJobTableIndex:
 	.skip 0x3
-.global synthAuxBMidiSet
-synthAuxBMidiSet:
+.global synthAuxBMIDISet
+synthAuxBMIDISet:
 	.skip 0x8
 .global synthAuxBMIDI
 synthAuxBMIDI:
@@ -2582,7 +2582,7 @@ lbl_8039AEEC:
 /* 8039AF00 00397E60  3B 6D AE 64 */	addi r27, r13, synthAuxAMIDI@sda21
 /* 8039AF04 00397E64  3B 8D AE 5C */	addi r28, r13, synthAuxAMIDISet@sda21
 /* 8039AF08 00397E68  3B ED AE 54 */	addi r31, r13, synthAuxBMIDI@sda21
-/* 8039AF0C 00397E6C  3B 0D AE 4C */	addi r24, r13, synthAuxBMidiSet@sda21
+/* 8039AF0C 00397E6C  3B 0D AE 4C */	addi r24, r13, synthAuxBMIDISet@sda21
 lbl_8039AF10:
 /* 8039AF10 00397E70  88 1B 00 00 */	lbz r0, 0(r27)
 /* 8039AF14 00397E74  28 00 00 FF */	cmplwi r0, 0xff
diff --git a/include/musyx/musyx.h b/include/musyx/musyx.h
index 6df2be59..cdc26f34 100644
--- a/include/musyx/musyx.h
+++ b/include/musyx/musyx.h
@@ -76,6 +76,29 @@ typedef struct SND_FMATRIX {
   f32 t[3];
 } SND_FMATRIX;
 
+s32 sndInit(u8 voices, u8 music, u8 sfx, u8 studios, u32 flags, u32 aramSize);
+void sndQuit(void);
+
+bool sndIsInstalled();
+bool sndIsIdle();
+SND_PLAYBACKINFO* sndGetPlayBackInfo();
+
+void sndSetMaxVoices(u8 music, u8 sfx);
+
+#define SND_USERMUSIC_VOLGROUPS 0xFA
+#define SND_USERFX_VOLGROUPS 0xFB
+#define SND_USERALL_VOLGROUPS 0xFC
+#define SND_MUSIC_VOLGROUPS 0xFD
+#define SND_FX_VOLGROUPS 0xFE
+#define SND_ALL_VOLGROUPS 0xFF
+
+#define SND_MAX_USER_VOLGROUP 20
+
+void sndVolume(u8 volume, u16 time, u8 volGroup);
+void sndMasterVolume(u8 volume, u16 time, u8 music, u8 fx);
+void sndOutputMode(SND_OUTPUTMODE mode);
+void sndSilence();
+
 #define SND_AUX_NUMPARAMETERS 4
 
 #define SND_AUX_REASON_BUFFERUPDATE 0
@@ -204,14 +227,14 @@ typedef struct SND_PARAMETER_INFO {
 
 } SND_PARAMETER_INFO;
 
-#define sndFXStart(fid,vol,pan)	sndFXStartEx(fid,vol,pan,SND_STUDIO_DEFAULT)
-SND_VOICEID sndFXStartEx(SND_FXID fid,u8 vol,u8 pan,u8 studio);
-SND_VOICEID sndFXStartPara(SND_FXID fid,u8 vol,u8 pan,u8 studio,u8 numPara,...);
-SND_VOICEID sndFXStartParaInfo(SND_FXID fid,u8 vol,u8 pan,u8 studio,SND_PARAMETER_INFO *paraInfo);
+#define sndFXStart(fid, vol, pan) sndFXStartEx(fid, vol, pan, SND_STUDIO_DEFAULT)
+SND_VOICEID sndFXStartEx(SND_FXID fid, u8 vol, u8 pan, u8 studio);
+SND_VOICEID sndFXStartPara(SND_FXID fid, u8 vol, u8 pan, u8 studio, u8 numPara, ...);
+SND_VOICEID sndFXStartParaInfo(SND_FXID fid, u8 vol, u8 pan, u8 studio, SND_PARAMETER_INFO* paraInfo);
 SND_VOICEID sndFXCheck(SND_VOICEID vid);
 bool sndFXKeyOff(SND_VOICEID vid);
-bool sndFXCtrl(SND_VOICEID vid,u8 ctrl,u8 value);
-bool sndFXCtrl14(SND_VOICEID vid,u8 ctrl,u16 value);
+bool sndFXCtrl(SND_VOICEID vid, u8 ctrl, u8 value);
+bool sndFXCtrl14(SND_VOICEID vid, u8 ctrl, u16 value);
 
 #ifdef __cplusplus
 }
diff --git a/include/musyx/musyx_priv.h b/include/musyx/musyx_priv.h
index e9a1e81c..4f80a999 100644
--- a/include/musyx/musyx_priv.h
+++ b/include/musyx/musyx_priv.h
@@ -38,6 +38,9 @@ void sndConvertMs(u32* time);
 void sndConvertTicks(u32* out, u32 seconds);
 u32 sndConvert2Ms(u32 time);
 
+void hwDeactivateStudio(u8);
+u32 hwIsActive(s32);
+
 extern SND_HOOKS salHooks;
 
 /* Math */
@@ -46,6 +49,11 @@ float salNormalizeVector(SND_FVECTOR* vec);
 void salCrossProduct(SND_FVECTOR* out, const SND_FVECTOR* a, const SND_FVECTOR* b);
 void salInvertMatrix(SND_FMATRIX* out, const SND_FMATRIX* in);
 
+
+/* hardware */
+/* TODO: Figure out what `unk` is */
+bool hwAddInput(u8 studio, void* unk);
+bool hwRemoveInput(u8 studio, void* unk);
 #ifdef __cplusplus
 }
 #endif
diff --git a/include/musyx/synth.h b/include/musyx/synth.h
new file mode 100644
index 00000000..030bebfb
--- /dev/null
+++ b/include/musyx/synth.h
@@ -0,0 +1,50 @@
+#ifndef __SYNTH_H__
+#define __SYNTH_H__
+
+#include "musyx/musyx_priv.h"
+#ifndef __cplusplus
+extern "C" {
+#endif 
+    
+typedef struct SynthVoice {
+    char data1[0xf4];
+    u32 _f4;
+    VoiceID* voiceId;
+    char data2[0x18];
+    u32 _114[2];
+    u8 _11c;
+    u8 _11d;
+    u8 _11e;
+    u8 studio;
+    char data3[0x404 - 0x120];
+} SynthVoice;
+
+typedef void (*SND_AUX_CALLBACK)(u8 reason, SND_AUX_INFO * info, void * user);
+
+extern SND_AUX_CALLBACK synthAuxACallback[8];
+extern u8 synthAuxAMIDI[8];
+extern u8 synthAuxAMIDISet[8];
+extern void* synthAuxAUser[8];
+extern SND_AUX_CALLBACK synthAuxBCallback[8];
+extern u8 synthAuxBMIDI[8];
+extern u8 synthAuxBMIDISet[8];
+extern void* synthAuxBUser[8];
+
+s32 vidGetInternalId(SND_VOICEID id);
+bool synthFXSetCtrl(SND_VOICEID vid, u8 ctrl, u8 value);
+bool synthFXSetCtrl14(SND_VOICEID vid, u8 ctrl, u16 value);
+bool synthSendKeyOff(SND_VOICEID vid);
+SND_VOICEID synthFXStart(SND_FXID fid, u8 vol, u8 pan, u8 studio, u8); 
+void synthVolume(u8 volume, u16 time, u8 volgroup2, s32, s32); 
+
+
+/* TODO: Move this where it belongs */
+void hwSetAUXProcessingCallbacks(u8 studio, 
+                                 SND_AUX_CALLBACK auxA, void * userA, 
+                                 SND_AUX_CALLBACK auxB, void * userB);
+#ifndef __cplusplus
+}
+#endif 
+    
+#endif // __SYNTH_H__
+    
diff --git a/src/musyx/snd_init.c b/src/musyx/snd_init.c
index 61c7f4f2..13ca05cc 100644
--- a/src/musyx/snd_init.c
+++ b/src/musyx/snd_init.c
@@ -9,7 +9,7 @@ extern s8 sndActive;
 extern s8 synthIdleWaitActive;
 extern SynthInfo synthInfo;
 
-inline bool DoInit(u32 rate, u32 aramSize, u8 voices, u32 flags) {
+s32 DoInit(u32 rate, u32 aramSize, u8 voices, u32 flags) {
   dataInitStack();
   dataInit(0, aramSize);
   seqInit();
@@ -23,17 +23,17 @@ inline bool DoInit(u32 rate, u32 aramSize, u8 voices, u32 flags) {
   return FALSE;
 }
 
-bool sndInit(u8 voices, u8 music, u8 sfx, u8 studios, s32 flags, s32 aramSize) {
+s32 sndInit(u8 voices, u8 music, u8 sfx, u8 studios, u32 flags, u32 aramSize) {
   s32 rate;
   s32 ret;
 
   sndActive = 0;
-  if (64 >= voices) {
+  if (voices <= 64) {
     synthInfo.voices = voices;
   } else {
     synthInfo.voices = 64;
   }
-  if (8 >= studios) {
+  if (studios <= 8) {
     synthInfo.studios = studios;
   } else {
     synthInfo.studios = 8;
diff --git a/src/musyx/snd_synthapi.c b/src/musyx/snd_synthapi.c
new file mode 100644
index 00000000..97645b33
--- /dev/null
+++ b/src/musyx/snd_synthapi.c
@@ -0,0 +1,140 @@
+#include "musyx/synth.h"
+
+bool sndFXCtrl(SND_VOICEID vid, u8 ctrl, u8 value) {
+  bool ret;
+
+  hwDisableIrq();
+  ret = synthFXSetCtrl(vid, ctrl, value);
+  hwEnableIrq();
+  return ret;
+}
+
+bool sndFXCtrl14(SND_VOICEID vid, u8 ctrl, u16 value) {
+  bool ret;
+
+  hwDisableIrq();
+  ret = synthFXSetCtrl14(vid, ctrl, value);
+  hwEnableIrq();
+  return ret;
+}
+
+bool sndFXKeyOff(SND_VOICEID vid) {
+  bool ret;
+
+  hwDisableIrq();
+  ret = synthSendKeyOff(vid);
+  hwEnableIrq();
+  return ret;
+}
+
+SND_VOICEID sndFXStartEx(SND_FXID fid, u8 vol, u8 pan, u8 studio) {
+  SND_VOICEID temp_r31;
+
+  hwDisableIrq();
+  temp_r31 = synthFXStart(fid, vol, pan, studio, synthITDDefault[studio * 2 + 1]);
+  hwEnableIrq();
+  return temp_r31;
+}
+
+s32 sndFXCheck(SND_VOICEID arg0) {
+  u32 check;
+  s32 ret;
+  check = vidGetInternalId(arg0);
+
+  ret = -1;
+  if (check != -1) {
+    ret = arg0;
+  }
+  return ret;
+}
+
+void sndVolume(u8 volume, u16 time, u8 volgroup) {
+  hwDisableIrq();
+  synthVolume(volume, time, volgroup, 0, -1);
+  hwEnableIrq();
+}
+
+void sndMasterVolume(u8 volume, u16 time, u8 music, u8 fx) {
+  hwDisableIrq();
+  if (music != 0) {
+    synthVolume(volume, time, 0x15, 0, -1);
+  }
+  if (fx != 0) {
+    synthVolume(volume, time, 0x16, 0, -1);
+  }
+  hwEnableIrq();
+}
+
+// sndOutputMode
+
+// clang-format off
+void sndSetAuxProcessingCallbacks(u8 studio, 
+                                  SND_AUX_CALLBACK auxA, void* userA, u8 midiA, SND_SEQID seqIDA, 
+                                  SND_AUX_CALLBACK auxB, void* userB, u8 midiB, SND_SEQID seqIDB) {
+  // clang-format on
+
+  hwDisableIrq();
+  if (auxA != NULL) {
+    synthAuxAMIDI[studio] = midiA;
+    if (midiA != 0xFF) {
+      synthAuxAMIDISet[studio] = seqGetPrivateId(seqIDA);
+      synthAuxACallback[studio] = auxA;
+      synthAuxAUser[studio] = userA;
+    }
+  } else {
+    synthAuxACallback[studio] = NULL;
+    synthAuxAMIDI[studio] = 0xff;
+  }
+
+  if (auxB != NULL) {
+    synthAuxBMIDI[studio] = midiB;
+    if (midiB != 0xFF) {
+      synthAuxBMidiSet[studio] = seqGetPrivateId(seqIDB);
+      synthAuxBCallback[studio] = auxB;
+      synthAuxBUser[studio] = userB;
+    }
+  } else {
+    synthAuxBCallback[studio] = NULL;
+    synthAuxBMIDI[studio] = 0xff;
+  }
+
+  hwSetAUXProcessingCallbacks(studio, auxA, userA, auxB, userB);
+  hwEnableIrq();
+}
+
+void synthActivateStudio(u8 studio, u32 arg1, u32 arg2) {
+    hwDisableIrq();
+    synthAuxACallback[studio] = NULL;
+    synthAuxBCallback[studio] = NULL;
+    synthAuxAMIDI[studio] = 0xFF;
+    synthAuxBMIDI[studio] = 0xFF;
+    synthITDDefault[studio * 2 + 1] = 0;
+    synthITDDefault[studio * 2 + 0] = 0;
+    hwActivateStudio(studio, arg1, arg2);
+    hwEnableIrq();
+}
+
+void synthDeactivateStudio(u8 studio) {
+    u32 i;
+    for (i = 0; i < synthInfo.voices; ++i) {
+        if (studio == synthVoice[i].studio) {
+            if (synthVoice[i]._f4 != 0xFFFFFFFF) {
+                voiceKillSound(synthVoice[i].voiceId->pubId);                
+            } else if (hwIsActive(i)) {
+                hwOff(i);
+            }
+        }
+    }
+    hwDisableIrq();
+    synthAuxACallback[studio] = 0;
+    synthAuxBCallback[studio] = 0;
+    synthAuxAMIDI[studio] = 0xFF;
+    synthAuxBMIDI[studio] = 0xFF;
+    hwEnableIrq();
+    hwDeactivateStudio(studio);
+}
+
+/* TODO: Figure out what `unk` is */
+bool synthAddStudioInput(u8 studio, void* unk) {
+    return hwAddInput(studio, unk);
+}