Don't know if it will work, but this is the only directions I could find in the manual.
Radio Mode: Repeatedly pressing the “SOUND” button moves you through 6 modes. VOLUME, BASS, TREBLE, BALANCE, EQ and TIME. Adjustment in anyone of these modes is done by pressing the “VOLUME” (+ or -) key. Controls can be modified differently for each room.
That's what I thought, but the volume up and down makes no moves fast forword and rev do not work maybe that's why the unit is at 0 for bass, treb, bal, ane eq. but for right now that's the least of my worries. chair slide leaks I just found the floor rotted at that slide wich leaks like a sieve the vents leak should start delaminating soon. I should have kept my catalina now im stuck with a lemon for years. the unit is a 2013 shoul not be doing this..