Just bought a new digital piano for my son (Yamaha Modx8) and the first thing I noticed is that it doesn't have any speakers. I have a Sony STR-DG820 AVR and a set of Dynaco A25's (aaahhhh the seventies...) collecting dust in the basement and I was thinking about hooking the new piano into that set up. My question is regarding which input to use on the Sony AVR. My thinking is that since no other component will be connected, I should be able to use whatever input I want, yes, no?( except for the HDMI inputs). The outs from the piano are your standard 1/4" jacks. Any thoughts on the best input to use in this situation? Thanks