I guess I’ve always noticed this to some extent, but now that I’m taking the time to look at it more carefully, all the pots on my two Mixup modules and my Outs module are noisy. When they are not passing audio, they are pretty much quiet when I turn them. But when they are passing audio, they are noisy. For the Mixups, the noise is especially apparent from around 2:00 to fully CW, and for my headphones out on the Outs module, it’s more apparent closer to fully CCW and fully CW. I tried using two pairs of headphones (monitoring both the headphone out and the main out). I’m also taking care to make sure I’m not clipping. It’s not really a loud crackling, more of a soft whooshing at times, other times more crackly, but never really horrible–which is probably why I kind of ignored it for so long.
So why is this the case? Can anything be done to fix it?
Note: On my Quad VCA, none of the attenuator pots have this problem.
Happy to send audio samples if needed.
PS: It’s only really audible with lower frequency signals like sine or triangle waves or filtered stuff.