Audio Transcoding

I have a World Edition 2TB (white) with Twonky 5.1.  Is there a way to transcode audio streams - I’m trying to send AAC files to a Linksys receiver that can only accept MP3 files? 

I’m not a linux person, so if there is a way can you suggest a step-by-step approach?

Thanks in advance for any help.

I would suggest you convert them