avtech 4 ch dvr h.264 sound issues

[reso65]

Hi all,
Everything works fine, except listening to audio over h.264, only gets met squeeks and bangs over the speakers...when I select quicktime in live view it works good, but..trying to playback files it puts me automatically back in h.264 and I can't select quicktime from there.
So, no sound playing recordings back. Please help!!!
Issue on different pc's (win 7, xp sp2, xp sp3 etc) , using viewer software and also when directly contacting the built in webviewer on the machine, must be a faulty h.264 codec from avtech but how to get a better one?

Thanks a lot,

Reso