Ok. Volumes work as should. But _still_ can't access the menu.
Tried mapping the menu for play/pause and for a VolumeDown buttons. The buttons act normally - no menü.
What to do?

umm... uhh... You are selecting emphatic from the Hijack menu first, right? Also, how do you know the volume buttons are working to move the menu selection left/right if you can't open the menu? I'm confused.

I can't find my Kenwood remote around here, so I can't test that particular button scenario. I just know it works with my Rio remote.