hi cybercow, you’re naturally quite right but the really annoying noise i’m experiencing isn’t just in my G Lab, it’s also on some of my amps (for example my blackface fenders) without even hooking up a guitar to them. i’m quite sure it’s coming from from my wall power and just getting amplified, especially more when i use higher gain. i’ve tried many different power filters, even the somewhat expensive furmans and can’t get rid of it. i have a carpenter under my studio and it most likely comes from there. some days it’s better than others. but… it seemed a bit better with the silicone buffer but then the volume/hum issue. this doesn’t happen with the GLab internal buffer. that’s why i thought maybe i would try the opamp buffer and see what happens there.