V/Oct Calibration

OWL Witch
#1

Could someone kindly explain the calibration process for the Witch? I would very much like to try it with my Eurorack.

I’m using OpenWareLaboratory as described, but when I hold down Button 1 or Button 2, the values I get gradually tend towards 0. Maybe there is something wrong with my build, but everything on the https://witch.rebeltech.org/ site appears to work as expected. This is my first OWL device, so… not sure if the problem is with my build or my understanding.

Hope someone can explain! TIA

#2

Hi Naenyn,

That tool is used for calibrating codec inputs/outputs and storing results on device. Unlike previous OWL based hardware, the Witch has AC coupled inputs/outputs. So it would filter out any static DC offset in its audio inputs, which would include V/Oct signal.

You can still use CV inputs for pitch CV and by default they are calibrated to track 1 V/oct over 5 volts.

#3

Ah-hah! Thank you for explaining. That makes sense.

I got pitch CV working fine today. I was expecting the trigger in for notes to be on the envelope trigger/CV instead of the note one.

Looks like I’m good to go. Thank you for the help. Fun device!

Edit: It might be a good idea to remove the V/oct calibration step from the end of the build doc. I followed the doc listed on Thonk.