budget of $500! All kinds of choices, from $59 to $450. Look at the Korg EK50 at $449 from Sweetwater. This is one you could possibly not only use as a potable fun unit but add to your setup for some additional sounds and flexibility.
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PSR 740,PSR 3000, Mirage, tx7, mp32, Pro Tools 10,11 SONAR, Reaper, BIAB 2020 and a pile of Computer Music mags w/disks
College student was working on Doctoral, Education Now just doing courses to do courses