Batch noise reduction (solved)

[cron]

I've got about 100 files of guitar harmonics I recorded, and unfortunately, they all have a bit of hiss/buzz in the background at about -55dB. It's not terrible in itself, but as soon as you start layering them up, you can really hear it.

Is there any app available (free or cheap, as usual) which would let me apply noise reduction to all the files? Maybe even a time limited demo of something?

Cheers!

edit: Got somebody else to do it for me.