As an exercise really, I am trying to implement the various tonewheel organs as set out in this vintage article
I am stuck here →
I am going to filter the sub-oscillator using the Juno's low-pass filter, with the cutoff frequency set precisely 19 semitones (one octave and a fifth) above the sub-oscillator pitch itself.
I don’t think we have an oscillator that has a built in sub right ? Ok cool I use 2 AMS VC03, with the second one pitched one octave lower, but then how do I implement its cutoff frequency as described above ? I am guessing I need the lowpass filter, setting its frequency by some calculated value inferred from the audio coming out of the oscillator, or from the cv going into it…
My best shot is to use a booster attenuator taking the same freq in, with an offset (and this is where I am not sure how to get 19 semitones), to drive the cutoff freq of a low pass filter.