Multi-channel

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Multi-channel is supported in next effects:

 BASS_FX_BFX_ROTATE
 BASS_FX_BFX_VOLUME
 BASS_FX_BFX_PEAKEQ
 BASS_FX_BFX_MIX
 BASS_FX_BFX_DAMP
 BASS_FX_BFX_AUTOWAH
 BASS_FX_BFX_PHASER
 BASS_FX_BFX_CHORUS
 BASS_FX_BFX_DISTORTION
 BASS_FX_BFX_COMPRESSOR2
 BASS_FX_BFX_VOLUME_ENV
 BASS_FX_BFX_BQF
 BASS_FX_BFX_ECHO4
 BASS_FX_BFX_PITCHSHIFT
 BASS_FX_BFX_FREEVERB

Multi-channel order of each channel is as follows:

3 channels	left-front, right-front, center.
4 channels	left-front, right-front, left-rear/side, right-rear/side.
5 channels	left-front, right-front, center, left-rear/side, right-rear/side.
6 channels (5.1)	left-front, right-front, center, LFE, left-rear/side, right-rear/side.
8 channels (7.1)	left-front, right-front, center, LFE, left-rear/side, right-rear/side, left-rear center, right-rear center.

Usage:
An effect supporting multi-channel has a param "lChannel", using flags:

BASS_BFX_CHANALL	-1	all channels at once (as by default)
BASS_BFX_CHANNONE	0	disable an effect for all channels
BASS_BFX_CHAN1	1	left-front channel
BASS_BFX_CHAN2	2	right-front channel
BASS_BFX_CHAN3	4	see above info
BASS_BFX_CHAN4	8	see above info
BASS_BFX_CHAN5	16	see above info
BASS_BFX_CHAN6	32	see above info
BASS_BFX_CHAN7	64	see above info
BASS_BFX_CHAN8	128	see above info

If you have more than 8 channels (7.1), use this macro:
BASS_BFX_CHANNEL_N(n)

See also
BASS_ChannelSeFX, BASS_FXSetParameters, BASS_FXGetParameters