Weird oscillation with Aion VH Drive channel

hereonmars

New member
Hi all,

I built this Aion VH Drive channel pedal (on the left in the video). It sounded great when I first built it and boxed it. I took the circuit out so my son could decorate the enclosure. When I reboxed it, it makes this weird oscillating sound when engaged. I am guessing maybe I knocked something loose, but thought I would post this video and see if anyone has run into something similar and might know a good place to start. With the back off and having it engaged, I noticed when poking around with my finger that IC4 was kinda warm to the touch- warmer than I expected but not necessarily alarming.

Any suggestions are appreciated. I can't wait to get this thing back and running so I can play early 90s death metal riffs.

video with the noise:
schematic: https://aionfx.com/app/files/docs/vh_drive_channel_documentation.pdf
gutshot:

PXL_20240929_005932471.jpg
 
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