add: if (sliderDisabled) return;
context: Slider (void){	int offs;	static int last_offs = -1;		if ((offs = GetSoundInfo (sliderSpace)) != last_offs ||sliderChanged)	{		sliderChanged = FALSE;		last_offs = offs;		buttonStamp.origin.x = sliderStamp.origin.x + offs;		BatchGraphics ();		DrawStamp (&sliderStamp);		DrawStamp (&buttonStamp);		UnbatchGraphics ();	}}