Hi - to add to the "Survey", I don't use MIDI files - not for any "active" or particular reason ... just was never part of my particular method (or dare I say my "style") of playing ... I have a bunch of them, and occasionally listen to them at home, but I have never used them while performing ... I'm sure they add a nice new/different way to play, and I can see that - might be fun to try - but ultimately I'll probably stick with my method where I play solo keys w/o styles sometimes (solo piano style), sometimes with a 5pc band I'm part of, and by using styles the rest of the time... thankfully there are lots of options and people can get creative in many ways with all the tools we have these days!
Jim
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Genos / Tyros5 / HK Lucas Nano 600 / FTB Maxx 40a / EV ZX1A / Rock'n'Roller cart / Hauptwerk virtual pipe organ / misc other audio & music toys