"Good mixers do not cost $45. "
I think this is similar to, if the the, actual mixer in question.
http://www.musiciansfriend.com/product/Behringer-Xenyx-802?sku=631263[eyecamiam]
I have 3 of 'em and they work just fine.
Surprising, really. (Read the consumer reviews.)
I also have Mackies and Shures and...
My suggestion to the OP is that if the bands want good recordings (with good audio,) don't shoot them LIVE in the club.
Alternately, set up a "session" (in the daytime at an empty club, or elsewhere and get the audio mix right... then shoot the video while syncing to the perfected audio track.
The LIVE situation (without a dedicated audio pro... mixing specifically for the recording) will always be "iffy" at best.
