extern void CALLBACK SPUwriteDMAMem(unsigned short *, int, unsigned int);
extern void CALLBACK SPUreadDMAMem(unsigned short *, int, unsigned int);
extern void CALLBACK SPUplayADPCMchannel(void *, unsigned int, int);
-extern void CALLBACK SPUregisterCallback(void (*cb)(void));
+extern void CALLBACK SPUregisterCallback(void (*cb)(int));
extern void CALLBACK SPUregisterScheduleCb(void (*cb)(unsigned int));
extern long CALLBACK SPUfreeze(unsigned int, void *, unsigned int);
extern void CALLBACK SPUasync(unsigned int, unsigned int);