Before I start I'm not intending to open up the can of mp3 vs. wav .vs other worms debate, so here it goes: Been using a yamaha mg16f/x mixer for basically summing down to 2 trks more so for rehearsing before recording songs all keys drum units etc are inline to mixer and control rm out to krk monitors. No Compression or limiting on. I always feel that the sound quality of this set up is, while fairly quiet, a bit strange kinda too in your face. ( I know it's hard to describe a sound). I plugged in an mp3/ wav player to play along with warm up my chops and the keys really sound different than the mix on the player even when down in the mix. any thoughts? i am not that experienced in recording as yet, so any advice is welcome.