diff --git a/include/musyx/musyx_priv.h b/include/musyx/musyx_priv.h
index 5c04e92b..ff683894 100644
--- a/include/musyx/musyx_priv.h
+++ b/include/musyx/musyx_priv.h
@@ -584,9 +584,9 @@ extern SYNTH_VOICE* synthVoice;
 extern DSPvoice* dspVoice;
 typedef s32 (*SND_COMPARE)(u16*, u8*);
 
-void dataInit(u32, s32);                                       /* extern */
-void dataInitStack();                                          /* extern */
-s32 hwInit(u32* rate, u8 numVoices, u8 numStudios, u32 flags); /* extern */
+void dataInit(u32, s32);                                        /* extern */
+void dataInitStack();                                           /* extern */
+s32 hwInit(u32* frq, u16 numVoices, u16 numStudios, u32 flags); /* extern */
 void hwEnableIrq();
 void hwDisableIrq();
 void s3dInit(s32);       /* extern */
@@ -626,7 +626,7 @@ void salInvertMatrix(SND_FMATRIX* out, const SND_FMATRIX* in);
 /* hardware */
 u32 salInitAi(SND_SOME_CALLBACK, u32, u32*);
 u32 salInitDsp(u32);
-bool salInitDspCtrl(u8 numVoices, u8 numStudios, u32 defaultStudioDPL2);
+u32 salInitDspCtrl(u8 numVoices, u8 numStudios, u32 defaultStudioDPL2);
 u32 salStartAi();
 void salInitHRTFBuffer();
 void salActivateVoice(DSPvoice* dsp_vptr, u8 studio);
diff --git a/src/musyx/hardware.c b/src/musyx/hardware.c
index 4b377a23..c19ba604 100644
--- a/src/musyx/hardware.c
+++ b/src/musyx/hardware.c
@@ -65,16 +65,16 @@ void snd_handle_irq() {
   hwIRQLeaveCritical();
 }
 
-s32 hwInit(u32* rate, u8 numVoices, u8 numStudios, u32 flags) {
+s32 hwInit(u32 * frq, u16 numVoices, u16 numStudios, u32 flags) {
   hwInitIrq();
   salFrame = 0;
   salAuxFrame = 0;
   salMessageCallback = NULL;
-  if (salInitAi(snd_handle_irq, flags, rate) == 0) {
+  if (salInitAi(snd_handle_irq, flags, frq) == 0) {
     // OSReport("Could not initialize AI.\n");
   } else {
     // OSReport("salInitAi() is done.\n\n");
-    if (salInitDspCtrl(numVoices, numStudios, flags & 1) == 0) {
+    if (salInitDspCtrl(numVoices, numStudios, (flags & 1) != 0) == 0) {
       // OSReport("Could not initialize DSP control logic.\n");
     } else {
       // OSReport("salInitDspCtrl() is done.\n\n");
diff --git a/src/musyx/hw_dspctrl.c b/src/musyx/hw_dspctrl.c
index 1028da8c..98b92175 100644
--- a/src/musyx/hw_dspctrl.c
+++ b/src/musyx/hw_dspctrl.c
@@ -29,7 +29,7 @@ s16* dspITDBuffer = NULL;
 DSPvoice* dspVoice = NULL;
 SND_MESSAGE_CALLBACK salMessageCallback = NULL;
 
-bool salInitDspCtrl(u8 numVoices, u8 numStudios, u32 defaultStudioDPL2) {
+u32 salInitDspCtrl(u8 numVoices, u8 numStudios, u32 defaultStudioDPL2) {
   u32 i;      // r31
   u32 j;      // r27
   u32 itdPtr; // r28