Theres no easy way is there?
I want to do it with a single button click. (And sans remote)

I tried using the Hijack knob press redefinition option.
I set it to "source" but it only seems to toggle between the player and the auxiliary.
And if I set the empeg to radio manually, and then press the button it toggles out of radio to aux or player but never back to radio.
What I would really like to do is redefine the bottom button hold down function from info toggle to source toggle.
Anybody have any idea on that, or am I dreaming?