I agree, unplug the unit and while it unplugged, individually press all the buttons on the face plate.
That will drain any stored capacitence and release any memory lock. Then plug it back in. I have owned a number of McIntosh pre-pros including the MX132 and this has always worked for me.
That will drain any stored capacitence and release any memory lock. Then plug it back in. I have owned a number of McIntosh pre-pros including the MX132 and this has always worked for me.