Downloaded trial version of TruePianos. Starting at about E3 and going higher, there is a faint but noticeable background noise when each key is played. It sounds like the rush of the wind at lower pitches, changes to sort of a ringing sound at higher pitches. The background noise begins slightly after the normal sound of the key and persists as the sound decays. My setup is Yamaha P140-> Core2 Quad -> Audiophile 2496 -> stereo system. I've run line out on this same piano through the same stereo system for a long time and have never heard this background noise, so I'm sure it has something to do with how I've configured Truepianos or the soundcard. Any suggestions on what might be causing this?
thanks

Yamaha P90, Kawai GL-10