ricecrispies
Member
When my audio interface (Scarlett 2i2) is connected to any device with a power supply independent of my computer, such as my bass amp, it captures ringing, buzzes and squeaks like this View attachment soundcard squeaks.mp3. The bass amp is earthed, but I get the same thing when I attach devices which are not earthed, such as my electronic piano. I have never been able to work out whether it is the computer power supply which is at fault, or the audio interface, or something else. Which would it be?