You asked what controller is best for SONAR. You didn't ask what was the best controller for X1 that you could also use w/ other daws or within a price range.
Sorry. Having used the vs700 for a while I can say it fits SONAR like a glove, which it should. Even over a short period available I got fast w/ it, almost like using an analog desk w/ every knob having a distinct job. Much better than some hobbled-together system where you are having to think before you reach, then think again before touching.
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