Can PSR 1000 / 2000 sequencer playback a Roland XV-3080 sound module ? I know I can use PSR as a MIDI controller... How about as a sequencer ?

Yes, you can use the internal sequencer to play out over 16 midi channels. Even the older Yamaha keyboards could do this so that you could send all your data into Cakewalk or other sequencer computer programs.
George Kaye
Kaye's Music Scene
Reseda, California