This sounds a bit like one of the Instruo oscillator, they have a sub and the different waveforms-C-SL or Troika, but maybe not the sub-octave unless that is the same as a ‘sub’? Thanks for all your time. I will try the Alma filter, was the original 24db sure I read that on the other thread. On my Kleine VCV version I used your EV3 oscillator would that have worked for the original Voyetra 8?