I’ve done some audio demo of the Harvestman Hertz Donut as a “standalone unit”, the audio path is just Hertz Donut and A132-3 VCA , no filters, no efx!
The only modules used to control the vco and the vca are a MFB ADSR on the VCA and a Plan B Model 10 on some sounds to control fm amount and wave discontinuity on the hertz donut.
The Hertz Donut is a voltage controlled digital dual oscillator that can provide sine, saw, tri and square waves on both the generators and a ringmod for the square waves.
The oscillators can work synched together in some different modes :
- No Sync
- “strong” Sync
As you can imagine except for the No sync option the other sync options go from a classic perfect sync to a bad , worse or even “stupid” wich forces the second oscillator out of sync in random ways, shifting the sync point .
The idea behind the Hertz Donut is to get a Zero-FM oscillator using a Primary (the first oscillator) and a MODULATION (second oscillator) with different kind of sync and modulation capabilities over Frequency , Wave Shape and AMP.
Frequency , Shape and AMP are the possible destinations of the modulation oscillator, the Hertz Donut is indeed a simple 2 operator FM & AM generator!