can’t you just use ocs 3 (in the high range) as a mod source on ocs 2 to get FM, then you’d have control over the depth with the amount control?
you could do this on the model d can’t you?
Sure, this is possible on the Voyager!
But on the original Minimoog you had to modulate the pitch of oscillator #1 and #2 always by the same source and with the same amount. On the Vojager you have way more modulation possibilities.