tag	line	file	source code
CTL_EXPRESSION	1143	drivers/sound/gus_wave.c	case CTL_EXPRESSION:
CTL_EXPRESSION	572	drivers/sound/sequencer.c	p1 = CTL_EXPRESSION;
CTL_EXPRESSION	908	include/linux/soundcard.h	#define SEQ_EXPRESSION(dev, voice, value) SEQ_CONTROL(dev, voice, CTL_EXPRESSION, value*128)