I did not find the QY100 an easy instrument to use live. It does not recognize chords as you think it would, so using the EL70 as a controller won't give you the control you expect. You will still have to control the QY independently. The QY100 is sort of like Band-In-A-Box in a box. What I mean is, it works on pre-programmed chords set to a rhythm. As far as using the QY as a sound source, that might work, but again there is the issue of ease of use - not user friendly, especially in a live situation. I would suggest a Yamaha MU50 or a Roland or Edirol Sound Canvas. If you really want to up the ante, get a Motif rack or a Roland, Korg, etc. rack unit, but then I think it would be more trouble to control.

When I owned the QY100, I liked it for what I could pre-program, but that was it. I am not familiar with the EL70, but I doubt it has the midi control needed to do what you want easily. My suggestion is to get a copy of the QY100 manual and seriously read through it OR borrow an actual QY100 and try it out. For as great a unit as the QY100 is, it seems to miss the mark for me and others I have talked with.

[This message has been edited by cassp (edited 04-06-2006).]