What components are common culprits of frying bacon sound?

[joulupukki]

I've got an AionFX Aurora Deluxe compressor pedal I built. It's probably a little over a year old with not that much use. Over time, it's progressively gotten worse though and at startup (and sometimes for a couple of minutes when I try to engage it after startup) it sounds like frying bacon. Yesterday, when I first tried enabling the compressor, it had really low volume and static. After a couple of cycles of bypass and back it started working and was then reliable.

Any suggestions or techniques I should use to zero in which of the many components in the circuit, could be bad?

Here's a little video of the frying bacon sound at startup:

 

[Robert]

If cycling active/bypass had an effect then the problem is most likely either the footswitch itself or a leaky input or output coupling capacitor.

 

[joulupukki]

Yesterday cycling the footswitch made a difference. Today, not so much. I'll make time hopefully soon to crack it open and double check the solder joints and those coupling caps as a starting point. Thanks @Robert !

 

[JTEX]

If it does it mostly at startup and it gets progressively better over time, it sounds like a bad electrolytic capacitor to me. Though I must say I've also seen a few op amps do that... If you have some Freeze Mist around, it could help with narrowing down a specific component.