SND_BBFPRO_GAIN_CHANNEL_SHIFT
channel = (pv >> SND_BBFPRO_GAIN_CHANNEL_SHIFT) &
channel = (pv >> SND_BBFPRO_GAIN_CHANNEL_SHIFT) &
(channel << SND_BBFPRO_GAIN_CHANNEL_SHIFT) | value;
channel = (pv >> SND_BBFPRO_GAIN_CHANNEL_SHIFT) &
knew.private_value = channel << SND_BBFPRO_GAIN_CHANNEL_SHIFT;