[Cyberdemon]

Originally Posted by cannyjock

It's a buzzing sound, typical electrical interference noise.

The one I got has a built in battery, it works OK on battery only just not when plugged in to USB. I couldn't find a USB powered one for a decent price that didn't have a battery. To be fair a lot of these type on Amazon say not to use it plugged in.

Here's the one I got:

https://www.amazon.co.uk/gp/product/...?ie=UTF8&psc=1

Gotcha - so when just on battery power, it seems to improve the sound? Or you still get interference? I found that other amp which just uses USB power, though I see it's out of stock already. Wonder if it's even worth trying.

I'm half deaf so honestly I don't even know why I'm bothering but it sounds like an interesting problem to solve.