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There is an 'official' tuning for the VCF. According to the Roland TB-303 manual, when playing C1 (65.4Hz) with the cutoff frequency knob set to 50%, saw waveform, and resonance knob at 100%, the resonance frequency should be 500Hz (give or take 100Hz depending on how it sounds to you). You can perform this tuning by either applying 3.0VDC to the VCO or finishing the entire assembly and using something like Keyboard mode to trigger the note. The cutoff can be adjusted by tweaking TM3.