Erica Synths DIY Polivoks VCO kit - Manual (Page 5)

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Take precautions with regard to electrostatic discharge (ESD) safety.
Handling components should be done in electrostatically safe environ-
ment. Use personal and workplace grounding. Any discharge (even a
minor one) from body to a component may permanently damage it.
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Polivoks has two VCOs with slightly different configuration: VCO1
has X-Mod functionality (it feeds audio rate signal from VCO2 into CV
input that results in frequency modulation like effects), VCO2 has
detune function, that detunes it for few semitones. Erica Synths
Polivoks VCO PCB is configurable for both VCOs. As the first step use
wire jumpers to select the VCO, you are about to build. Note that R47 is
10k for VCO1 and 1M for VCO2. Also VCO2 needs two 1M (39k on the PCB
silkscreen) resistors. Those are skipped for VCO1.