Sound problem on T41p

[cbell]

Hi everyone
I just got a new t41p 2373-ghg and I really love it except one issue:
When watching TV (via Adaptec Videoh! USB2.0 Media Center, latest drivers) or playing MS FlightSim Century of Flight, I hear a clicking sound when there are rapid changes in sound intensity or volume.
I have SP2 installed, but the problem was also there with SP1. I have installed the latest drivers from the IBM support website.

Anybody any ideas?