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Old 16th September 2013
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Originally Posted by m.o View Post
Did it matter at all if you had the Mopho connected to USB?
No, this is a fundamental problem caused by a poorly filtered internal voltage reference. It happens whether USB is used or not, whether midi is used or not, or even whether the supplied power pack is used.

Every internal control voltage in the synth is affected by the noise superimposed onto the DAC's reference voltage. Filter cut-off, resonance, output volume via the VCA, everything. The pulse width does show the fault more simply because that particular part of the electronics is more susceptible to this type of noise.