The thing is, Fran... you aren't really using the MS as an arranger. I can go out, get just about any keyboard on the market, and do exactly what you are doing. Doesn't make them an arranger...

Would you honestly go and do a styles only gig with the MS as your sole keyboard? No On Bass Inversions, no Breaks, no way to easily balance live play vs. style? No decent styles without running a legacy Yamaha style (no Mega voices, no SA, pretty wanky XG soundfont unless you do hours of conversion)...

The truth is, when you use MP3's, you AREN'T playing with the MS. You are playing with every other keyboard you used to make the track (presuming you aren't merely using commercial karaoke tracks) and merely using the MS for a few VSTi sounds. The fact that it stays home the majority of the time only proves OUR case, not yours! This thing has been sold to us since Day 1 as an ARRANGER. The fact that you don't use yours as one speaks volumes.

I'll admit, from all indications, the MS has a lot going for it as a kind of Neko competitor. But the Neko isn't an arranger, and doesn't pretend to be, even though I'm sure with a bit of finagling, you might get LS to run on that too...

When you use the MS in arranger mode to make all your MP3 tracks, and you take some other, nice light keyboard out on the gig, THAT will be the day that you CAN say you 'play live with an MS', but while you leave it at home and play to tracks that are primarily made on other keyboards, I'm afraid that doesn't really count. If I made MP3 tracks of all my G70 backings, then went out and gigged on a GW-8L, would I be doing the gig on the GW-8, or would people be listening primarily to the G70...?

If you can't gig on an MS in style mode, then it's NOT an arranger. Period.