Squeezelite Slider Volume Control Doesn't Work with Meridian Explorer2

I just installed the latest versions of PCP/LMS/SL on an RPI-4B. All looks and seems to otherwise work great except that I can't adjust the volume - much - using the Squeezelite volume control slider. I can hear the very low volume of music playing, but sliding the slider left and right doesn't alter the volume much. The volume moves from inaudibly low at the lowest to very low at the highest. The volume slider does work with the only other software app volume controlled device I have, the Resonessence Herus DSD DXD.

I did a search here and didn't find anything on the Meridian Explorer2.

Any insights would be appreciated.

Thanks!