Well, thanks for the vote of confidence, chas but I think you are getting a bit ahead of us here. I don't see the reference anywhere to using the mp3's, or even sequences, in a full band situation. Yes, I see them used in shows, as you rightly point out, but a regular club gig with a real rhythm section? Much rarer... About the only place I see this now, much, is bands that don't have a keyboard player at all..!

OTOH, there are outfits that are primarily singers, with maybe a couple to back them up, or just a solo. To be honest, I see this situation as much more of an extension of the OMB... an OMB with multiple singers, if you will. For this kind of act, economics dictate a reduction in the rhythm section unless you can find the rare gig that supports a six piece or more on a regular basis. Those are getting harder and harder to find these days.

But you are right... amateur hour indeed, using tracks in a full club band, IMO, too...
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An arranger is just a tool. What matters is what you build with it..!