and stereo to mono

I use Wavelab for my batch processing..it has a great batch processor tool...

If you're just looking for just a batch processor take a look at
http://www.goldwave.com/

or

http://www.blazemp.com/

I just went into Google and put in Audio Batch Processor and I'm sure you could probably find a free one by doing that.

Opus :D

You might want to check out [="http://www.voxengo.com/product/r8brain/"]r8brain[/]="http://www.voxengo…"]r8brain[/] from Voxengo.
There is also the [[url=http://="http://www.voxengo…"]pro version[/]="http://www.voxengo…"]pro version[/].
Windows OS only.

oh yeah. i'm looking for os x.

check peak from bias for osx (mac only), the choice IMHO

Adobe Audition (formerly Syntrillium Cool Edit) works really well for me.

okaydigital wrote: Adobe Audition (formerly Syntrillium Cool Edit) works really well for me.

That's PC only...he needs mac OS X software!

Opus :D