Sony Vegas audio trouble

POJ said:

i used 32 channels of audio

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Unless you are aiming to produce an audiophile quality production, there should be sufficient choices when rendering to the Sony options - I render to Sony AVC at maximum video bitrate and 384 kbps audio at 48 khz, 16 bit (I could go to a higher bitrate with the audio but there is no real value in doing so due to source limitations). Even as an audiophile, I have found the audio in all my video renderings is still quite good enough unless as mentioned before it is for audiophile purposes (though I mainly deal with old motorsport videos).

If it is for audiophile purposes you are better off to deal with the audio separately as PCM and then merging it with the video. You could for example author a blu-ray disc so you have much higher bitrate video (rendered separately) and a high quality, uncompressed 24 bit audio track (see the blu-ray rendering options where the audio is blanked out).

Render out the audio and see if you still get the same quality (or lack thereof). There are more than enough render options for sure. As Fiddle Faddle stated, try authoring Blu-ray disc or other PCM formats.

You state you have 32 tracks... Hopefully they are no overloading the final bus mixer. What are your levels? Do you have any plug-ins on either of those tracks?