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just curious, is there something missing from platforms/libs like csound, max for live, supercollider etc you were aiming for?

Yes, a lot, too much to write in a comment box though: http://audiokit.io/features/

excellent, i'm willing to learn swift or obj-C for this, are they API-equal?

(actually i don't know much about M4L, supercollider or those others, but i do have a bunch of HW synths: kurzweil, DSmith, emu, kawai etc

Either one is fine for AudioKit. Swift is still evolving a bit, might want to stick to Objective-C if you're learning.