If I can have USB running at the same time as MIDI, I can send the entire UPS (or at least the right UPG) data to the G70, removing the need for it to be in the G70 in the first place!

Pretty heady stuff.

You still haven't said whether there's a transposing MP3 player, though...
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An arranger is just a tool. What matters is what you build with it..!