As I understand it, software for driving the visuals while listening to the radio doesn't exist yet. The problem there is feeding the signal back into the CPU. In the Mk1 this is impossible, but the Mk2 has an ADC, so it might be possible on the Mk2. I think it is only a single channel ADC though - the guys@empeg will have to fill you in properly on all of that.

(list 6284, Mk1 S/N 00299 4GB blue [for sale]. Mk2 S/N 080000094 6GB blue)