To: Eddy666
Hello,
Actually, audio quality depends on device. I just can advise you to play with it's settings, see AVS Video Recorder>Settings tab.
As for file size, it depends on to which format you capture video - Recommended, Native or MPEG-2, in Native and MPEG you can try different presets with output settings. Than lower bitrate, than lower output files size.
I hope it helps.
Regards.