Got my Sub 37 last week and was also facing some problems in the first. But I have to admit, manly due to my misunderstanding.
From what I understand, you also managed to get the gate set up properly. So you need to set CV-Pitch settings correctly.
First you should check, if you selected "V/Oct" ant the AK. Using "Hz/Oct" will lead to massive shifted tones on the Sub37.
Second big mistake I made was, I forgot how CV works. The CV Notes send from AK to Sub37 can be transposed using the keyboard of the Sub 37 e.g. you send C2-D2-E2 from AK via CV and press maybe D2 on the Sub37 you'll get D2-E2-F#2.
That's quite useful for live performance, but if you also send Midi-Notes from the Sub37 to the AK, you double this up somehow and get a massively shifted result. So be shure not to accept Midi notes on the CV-track from your Sub37.
If that's working, go for the CV scaling procedure. Press C2 on the Sub37 and make shure you hear C2. From now don't touch the Sub37!!!
Then select C2 on the AK in the scaling menu, select 0.000V and press OK. Change the voltage until you can hear C2 from the Sub37 by pressing OK on the AK. Then go to the second note and maybe select C4 and a voltage of 2.000V. Hit OK and change the voltage until you hear C4 from the Sub37. Now it should be in tune perfectly.
You can play the Sub 37 via the Keys of the AK. Now, if you hit any key on the Sub 37, the notes on the Sub37 should be transposed to C2. Hit C2 on the Sub 37 and everything should be in tune again.