It seems to me that if there is a way to modify the player software to implement the concept of modes (setup and playback) then in setup mode, pushing the knob will repeatedly bring up settings to dial in. If it is in playback mode, pushing the knob repeatedly will bring things up like "Visuals" "Song Scan" "Song Skip" that sort of thing. So if you bring up "Visuals" it pops up a bar graph that looks a lot like "Loudness" except when you twist the knob it spins through all the available visuals. Ditto with songs, etc etc.

Like somebody else said, if you're tweaking settings, you're likely to want to tweak all sorts of different settings. Once dialed in, setup mode can be exited. When you're playing back songs, you're likely to want to do all manner of things related to playback (pick visuals, pick songs, shuttle through a song, etc, etc) and want nothing at all to do with loudness, fader, balance--that stuff is wasted!

Calvin