Thanks for the replies! I grok the incompatibility issue now. I'm mainly looking to add to my polyphony so as to be able to make easier use of different patch sets simultaneously, i.e., an orchestral & techno set at the same time without plugging my PC into the loop. That always involves SO much more work! I'd also like a more portable unit to haul around for live work without exposing my base 01/Wfd to the wear n' tear. I usually just need to play live without the sequencer present, but that's life! Perhaps I can lay hands on an 01/RW or 03/RW and a coupla RAM cards someday to cover those bases. Too bad in a way...it'd be real "Jetsons" to have all my 01 sounds in a cigar-box-sized unit I could carry around in my coat pocket like a buncha fake Rolex watches! Thanks again, guys.