Superbooth 22: AtoVproject DHO Dual Harmonic Oscillator
AtoVproject has a fascinating Dual Harmonic Oscillator (DHO) to bring to Superbooth along with a novel VCA inspired by Class-D amplification technology.
It’s experimental, open-source and very much a prototype but the Dual Harmonic Oscillator is looking very interesting indeed. It contains two harmonic oscillators that generate four octaves of triangle waves. You can control each harmonic with a VCA. You can then apply some thru-zero FM, wave folding and mess it about with some internal digital modulations.
The four harmonics of one oscillator are mixed and used as the Thru-Zero FM modulator for the other oscillator. This is all modulatable in increasingly complex ways before being mixed together and fed into a 3-stage wave folder.
The internal modulation engine is based on video game algorithms because I mean, why wouldn’t it? You can harness one knob to control multiple parameters at once by offsetting each parameter individually using algorithmic smooth noise. Apparently, that’s a bit like Sample & Hold.
Of course, unpredictability is a big factor pushing you into an exploration that you can also return from. There are 10 LFOs in there which sounds like some kind of madness. It’s going to get complex.
I can’t wait to see it in action.
Something more graspable is the cDVCA or class-D VCA which is a novel concept that builds a VCA from class-D amplification technology. Your input gets turned into an ultrasonic PWM signal which is scaled to the desired amplitude and filtered back down to the original. In an interesting twist the PWM frequency can be lowered into the audio spectrum and controlled via a 1v/oct input. This results in some crazy waveshaping.
You can drive in some distortion and filter out harmonics if it all gets a bit aggressive. With nothing plugged it has a tendency to generate a square wave which you can use as a simple synth voice.
All right, so I said it was more graspable but I’m still going to have it see it working to understand what on earth AtoVproject are talking about. Nice looking module though and should be available in June for €225.
AtoVprojuect is also running a workshop on the 16n Rework CV, I2C, MIDI/USB fader controller on Thursday morning. The workshop and kit will cost you €245 and space is limited so be sure to book. Everything is provided. Otherwise, you’ll find AtoVproject on booth 0400.