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 SPUwriteDMAMem(unsigned short *, int, unsigned int);
extern void CALLBACK SPUreadDMAMem(unsigned short *, int, unsigned int);
extern void CALLBACK SPUplayADPCMchannel(void *, unsigned int, int);