Inside Macintosh: Sound
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Early versions of the Sound Manager allowed application developers to use modifiers to alter sound commands before being processed by the Sound Manager. The Sound Manager no longer supports this capability. SndAddModifier is documented here for completeness only.
The Sound Manager previously used the SndAddModifier function to link modifiers to sound channels.
FUNCTION SndAddModifier (chan: SndChannelPtr; modifier: ProcPtr;
id: Integer; init: LongInt): OSErr;
The SndAddModifier function installs a modifier into an open channel specified in the chan parameter. The modifier parameter should be NIL , and the id parameter is the resource ID of the modifier to be linked to the sound channel. SndAddModifier causes the Sound Manager to load the specified 'snth' resource, lock it in memory, and link it to the channel specified.
The SndAddModifier function is for internal Sound Manager use only. You should not call it in your application.
The only supported use of the SndAddModifier function is to change the data type associated with a sound channel. For example, you can pass the constant sampledSynth in the id parameter to reconfigure a sound channel for sampled-sound data. You should, however, set a sound channel's data type when you call SndNewChannel , not by calling SndAddModifier .
To modify sampled-sound data immediately before the Sound Manager plays it, you can customize double buffering routines so that your application can modify sampled-sound data when it fills a buffer of sound data for the Sound Manager to play. For more information, see "Using Double Buffers" .
To change the initialization options for a sound channel, you can use the reInitCmd command. For a description of that command, see "Sound Command Numbers" .
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