Just in case your synth rig needs a sub oscillator, here’s a DIY project from Analog Labs Swiss:
This is an easy DIY Sub Oscillator project I’ve made for my Behringer Crave synth but it’ll work for Euroracks also. It tracks a Sawtooth or Triangle signal (10Vpp with 0 offset) or a simple Square wave and output a -1 and a -2 octaves down Square waves. Avoid PWM signals. It’ll not good at traking them. It was tested at 9V and 12V and works well with Crave & Neutron Synths from Behringer but also with Eurorack’s VCO. CD4013 is powered from 0 and 9V (or 12V). The 100k linear potentiometer acts as a mixer to blend the 2 sub osc signal output. At 50% position, it’ll output the famous SH-101 Pulse sub oscillator.
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