I think this is how you set bass/treble presets: Press "sound" for 2 seconds, the "B" (bass) level for one of the presets will show. press sound once to jump between presets, press and hold sound to change between bass and treble of the same preset. Twist the knob (in REW/FF mode) to adjust. When you're done, press enter and presets will be saved.
Doesn't this sound like touch-tone class registration? I could be wrong about the method (I really think Sony should've made it easier to use, this is too much for my brain), so some E900 user please chime in

Odin, I wish I could audition all of those... everyone seems to complain the same thing about the ST880, but I'd like to hear it, just to see what it sounds like.
From my experience, JVC doesn't take on the Panasonic sound. They use more treble (Sharp-esque) and cuts down on the midrange... Happy reviewing!