First off I'm not really a expert in this but I have used vegas before and it worked fine. But with my new computer I am unable to render audio in greater quality then 56kbps with mp3.

When rendering to a .avi file and selecting MPEG Layer-3 for audio the maximum quality that I can choose is 56kbps.

Also I've installed AC3 codec but it dont even show up on the list of choosable codecs when rendering.'

Maybe this is a problem with vegas not willing to accept the codecs or something i really dont know... All help is appreciated! Thank you in advance.

Edit: After some googling I came across this Download LAME ACM Codec 3.97 - It enables you to use the Lame MP3 encoding engine in e.g. VirtualDub, FlasK MPEG etc - Softpedia wich alowed the Lame mp3 codec to be used by editing software. So problem solved

Are you using a demo V7, some bits are not available.

If you are talking about mp3, then select mp3 and then just underneath select a profile for it, there should be higher options there if not then the buttons on the right allow you to modify the preset and make a new one.