Unplugs a channel from a mixer.
|handle||The handle of the channel to unplug.
If successful, then TRUE is returned, else FALSE is returned. Use BASS_ErrorGetCode to get the error code.
|BASS_ERROR_HANDLE||handle is not a mixer source.
If this function is called from within a mixtime sync callback and the source has the BASS_STREAM_AUTOFREE flag set on it, then the source will be freed asynchronously (in another thread) to avoid delaying the mixer's other processing.