Wolfi, have you tried recording sound independently of the Q3? You could sync video and sound later on in editing. Then again if you are willing to do separate audio and video recordings, an inexpensive DSLR would be a good option as it will give much better image quality. You also have the option of buying or renting some really good lenses to use with it.
Thanks for the handbrake tip -you are right -I can play the Hammerklavier forwards and backwards in the time a .mov uploads to YouTube -well I could if I could actually play it, which I can't -