I want to have my upper 1 sound at a set volume, but control upper 2 with the volume/expression pedal. HELP!

Tell me more about those three assignable buttons. Why don't the red lights stay on? What are you using them for? I think I set them to 1 rotor fast/slow, 2 Song melody mute and 3 Style ??? Mute.

What else can I use my damper input for? I thought I read something in the big owner manual and even saw something in a global menu(?) but I can't find it now. Help?