iterate through voices:
	
	skip locked voices
	
	get parent channel
	get parent track
	get voice update flags (uf)
	add channel uf and global uf
	
	if uf & volume:	
		compute volume:
		fv = ext:vol(v * gv * cv) * mv
		voice.sig = fv
		update nax.vol
		
	if uf & panning:
		compute panning:
		fp = ext:pAN(p)
		update nax.pan

	if uf & pitch:		
		compute pitch:
		fp = ext:pitch(voice.pitch)
		translate pitch
		update nax.pitch
	
	if uf & filter:
		compute cutoff,resonance:
		cutoff = ext:cutoff(voice.cutoff)
		reso = ext:reso(voice.reso)
		if( cutoff & 128)
			disable nax.filter
		else
			set nax.filter

	reset uf
	<next>