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An error in my previous reply...when i said "Set your synth for PM", I meant "Set your synth for PW".
And, if you don't have an O-Scope for measuring the PWM waveform, you could set the PWM speed to its slowest speed and use your multi-meter to watch the voltage change. If your meter isn't too slow, you might be able to infer what the voltage range is. You're trying to evaluate whether the range of the PWM is substantially bigger or smaller as when in PW mode. Most likely, it is the same. Since you can trust your PW measurements from your multimeter (because they're DC values, not changing AC values), you can feel confident that you understand the voltage range of the CV signal that you're extracting.
Chip