Is there a reason why you wouldn't just set the ZLD to 75% volume at all times, and then just use your remote for the stereo to adjust the volume? This is what I've done with my EQ's in the past, wondering if I'm missing something.... I just know that I don't want to go over 35 on my radio's volume remote, and my EQ is always set to the same volume. I just find it easier to hit volume buttons when in a boat than turning a knob.

Obviously this would only be if running your input through your stereo, and not directly through the aux in for the ZLD, in which case, ignore me.