Original Peaks design – E. Gillet
Power on the module while holding in the second black button – the one for selecting ENV, LFO etc.
If it works, all the lights will be on. From here, you can calibrate the module. The knobs 1,2,3,4 equate to Out 1 Coarse, Out 1 Fine, Out 2 Coarse, Out 2 Fine.
Connect a calibrated multimeter to Out 1, then adjust the Out 1 Coarse to as close to 0v as you can, then use the Out 1 Fine to get it to -0.001v or better.
Repeat for Out 2.
Press the Split button at the end to save the calibration.