SndAddModifier
SndAddModifier Install a synthesizer into an open channel
#include <Sound.h> Sound Manager
OSErr SndAddModifier(chan, modifier, id, init);
SndChannelPtr chan; a pointer to a sound channel
ProcPtr modifier; should be NULL
short id ; is a resource ID
long init ; is an initialization option
returns Error Code; 0=no error
The SndAddModifier function installs a synthesizer into an open channel
specified in the chan parameter. SndAddModifier causes the
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
Returns: an operating system Error Code.
noErr (0) No error
resProblem (-204) Problem loading the resource
badChannel (-205) Channel is corrupt or unusable

Notes SndAddModifier is for internal Sound Manager use only. You should
not call it in your application.