urn on voice event */
 SSE_VOICE_OFF=2, 				/* turn off voice event */
 SSE_CHANGE=4, 				/* change instrument */
 SSE_GENERAL=6 				/* system-specific event */
} SoundStreamEvents;
/* The following macros may help when constructing music buffers */
#define General(command)  SSE_GENERAL, command
&nbsp;
#define Rest(duration)  General(GE_NO_EVENT), DeltaTick(duration)
&nbsp;
#define VoiceOn(voice,freq,attack)  SSE_VOICE_ON, voice, freq, attack
#define VoiceOff(voice) SSE_VOICE_OFF, voice
#define ChangeEnvelo