I am a n00b in the field of electronic music production, as I have been played acoustic piano for years.
I am trying to connect my digital piano, a Kawai CN37, to guitar pedals.
I have the following setup:
Piano LINE OUT -> Guitar Pedal (boss DS-1/ Zoom gx1on) -> USB Audio Interface (Behringer 202HD) -> Piano LINE IN
So the idea is to use the piano speakers to emit sound.
The problem is that often I get a high pitch distorted sound even when I am not playing anything. This happens when the output is the piano speaker, but NOT when the output is the headphones. With the DS-1 I can get rid of it by adjusting the gain on the USB interface. However for the Zoom gx1on, I can't actually get rid of it , even with the lower gain setting.
My understanding is that it has to do with the level used by the different device. The piano uses a Line Level, the pedals are Inst, and I can change the level on the USB interface from Line to Inst. However, I couldn't manage to get rid of the ringing noise.