I want to record my amp without a mic and hear it at the same time.
I have a Yamaha THR10 and a Focusrite Scarlett Solo. When I plug in the headphone out of the amp into the line input of the audio interface and listen to it using the direct monitor option of the audio interface (and some headphones) there is an annoying high-medium pitched buzz.
Skipping, the audio interface and plugging my headphones directly into the amp causes no buzz. I tried different cables and changing the gain or volume on the interface was also not the problem.
So basically with buzz: Guitar -> (input) AMP (headphone out) -> (line in) interface (Direct monitor out) -> headphones
Without buzz (but no recording ability): Guitar -> (input) AMP (headphone out) -> headphones
What causes the buzz and how can I resolve this?