Audio Noise Reduction Software

[BrotherDave]

Hi all,

I have a Olympus WS-331M audio recorder/mp3 player.

I'm recording a classroom lecture.

I notice there is a constant hiss in the resulting WMA. This hiss is not there when I record w/ my PC so I think it's the Olympus' mic or circuitry.

I'm wondering if there is some (preferably cheap) audio noise reduction software I can zap the WMA with to try and clean it up.

Any thoughts?

Thanks,
Dave