1222 Tuner VCO Module

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This:

Need some help with the kosmo vco w/ tuner. Please! I’ve lost weeks

No, it’s a summing node, and I shouldn’t post when I’m low on caffeine You need to measure the voltage on the other side of the 100k resistors to see the voltages going into the node. So I’d suggest: With power off, make sure that you have 100k resistance from the centre note trimmer output to pin 15. Check the same for fine tune, the octave selector, and CV in. Power on, and measure the voltages on the centre note trimmer and the others, on the trimmer/knob side of the …