Is it just me or does anyone else notice, for lack of a better description, a wavering or underwater sound from some of the piano and acoustic guitar RealTracks? I'm using an ibm T60 with 3g of ram and a 500 gig hd with xp pro and service pk 3. I have a pair of these and I hear the same wavering from both. My pa is a bose L1 model 2 with the bose mixer.