I thought of this too but decided it wasn't practical due to the ergonomics needed to use an arranger. Getting to the intro/verse/chorus/fill buttons while playing could be a little difficult if the arranger was rack-mounted... I personally like having those buttons very close to my hands. Certainly you could assign midi controller buttons to this function or use an MFC foot control or some other scheme, but setting up MIDI functions isn't something that a lot of arranger players want to get into. That's why there have been many table-top arranger units made. I would be in favor of Yamaha coming out with a successor to the QY-series and I've seen calls for this in non-arranger forums as well. I think a table-top QY-3000 (based on the PSR3000) would be cool and useful.
[This message has been edited by The Pro (edited 03-09-2005).]
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Jim Eshleman