draw_control
void draw_control(struct aiomixer *, struct aiomixer_control *, bool);
draw_control(aio, control, true);
draw_control(aio, control, true);
draw_control(aio, control, true);
draw_control(aio, control, true);
draw_control(aio, control, true);
draw_control(aio,
draw_control(aio, control, false);
draw_control(aio, control, false);
draw_control(aio, control, true);
draw_control(aio, &class->controls[i], false);
draw_control(aio, lastcontrol, false);