Thanks for this update! My reported problem about the volume level seems to be fixed!

But Videos are still out of sync. I have this problem with the N810 demo video (Nokia_N810.avi) and streamed/reencoded media from my HTPC (vdr with streamdev-server, mencoder). These files are played in sync on my desktop pc with MPlayer 1.0rc2-4.1.3 (Ubuntu 7.10). Any suggestions?

EDIT:
Forgot to post used device and OS version
N800 with OS2008, latest mplayer version .23