The core of the VCO is borrowed from famous Russian synth Polivoks VCO and in exponential converter we use the original matched transistor IC that was used in Polivoks. But there are significant updated schematics to have the most out of your modular setup.
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Erica Pico RND is combined LFO/random source module.
It generates sine LFO waves, white noise, S&H CV and some interesting stuff – random triggers and pulse wave with random duty circle; basically, everything, you need, to bring some uncertainty in your modular setup.
Sine and pulse LFO with manually controlled frequency