Karma won't turn anything into an arranger...
It has certainly failed to make the M3 or the original Karma into anything you could take to a gig and perform much acoustic music.
If all you are doing is electronica, well, the market is FULL of different things that excel at doing that, software and hardware alike. But the minute you throw in the need to perform anything played by REAL PEOPLE, your options for a live music tool shrink drastically.
It is one thing to speed up or down, or transpose up or down an arpeggio (that's all you basically have to do!), but the rules for say a guitar part, or piano part doing the same thing are TOTALLY different. Different chords need different shapes, different speeds need VERY different performances, going from one chord to another involve another set of rules. All of these things are beyond the simplistic rules of Karma.
Yes, yes, I know all about the Karma's ability to induce random and non-linear behavior, but it is STILL all about the arpeggio or rhythm pattern, and not based on fundamental rules that apply to REAL musicians. Until Karma provides a set of tools adequately describing the behavior of acoustic, living breathing musicians, all it is is a fancy way to produce electronica...
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An arranger is just a tool. What matters is what you build with it..!