Mystery noise. Audio sample here. Piano is turned on at the 2 sec mark. Noise is from the 7 sec mark. Clip length is 23 sec.
I have a brand new Kawai ES920 digital piano. It has USB MIDI and unbalanced 3.5mm Line In. If I connect USB (for MIDI in) and 3.5mm (line out from PC) to the same PC, a...