SndAddModifier
SndChannelPtr chan; a pointer to a sound channel
short id ; is a resource ID
long init ; is an initialization option
Sound Manager to load the 'snth' resource, lock it in memory, and link it to the channel specified.
chan a pointer to a sound channel
modifier should be NULL
id is the resource ID of the synthesizer
init specifies an initialization option that should be sent to the
synthesizer when you open the channel
noErr (0) No error
resProblem (-204) Problem loading the resource
badChannel (-205) Channel is corrupt or unusable
not call it in your application.