I feel that the Newgrounds Audio Portal, and Flash Portal should not be two separate entities in the sense that they are moderated differently. Certainly there are more aspects of design regarding Flash Animation, however I feel they should be graded the same way.
Newgrounds Audio Portal artists have approximately 20 minutes of recognition before their audio is lost in the abyss of new material. Once a song makes it to the bottom of the "Recent Submissions" list, it is no longer recognized (outside the Top Songs list, and the bleak possibility of receiving the "Best of The Week" spot) When compared to the Flash Portal, the major differences are the flags such as (Under Judgement, Great Score, etc.) and the 20 additional spots available on the Recent Submissions list. This leaves the Audio Portal Artists with much less of a possibility to receive any sort of notoriety for their submission.
I believe that a combination of the "Blams", "Saves", and Recent Material Flags (Great Score!, Under Judgement, etc.) lead to less "Zero Voting," more critical reviewing, and a more fair community in general. With the flags in place, artists generally take a look at items under "Great Score!" or "Verge of Death", this means that if an artist has been blatantly promoting their material on other websites, or having friends all vote 5 on the submission, it will be noticed, and if these grades were not parallel to the quality of the material submitted, a concordant grade will be made by other artists who notice this fact, leaving the Artist with a more realistic grade. The opposite situation is also true, if a user is unfairly voted zero upon, and is "Saved", the users who "Save" the material are accredited with this, and the Artist who submitted the material still has a chance to be noticed by the community.
Also correct me if I am wrong, but I am pretty sure each user's "Voting Power" is based off a scale determined by the Flash Portal. It would be more appropriate if each portal had a different Voting Power based off reviews, Saves, and Blams. Or at least a mix of the two. Currently there is no system in place within the Audio Portal that rewards users that constantly review material, or give appropriate grades.
For instance, if a user constantly zero votes new submissions, and then the song turns out to be a hit, the user's voting power should go down. And vise versa.
Sorry for such a long post...