MP2 Converter

Hello again EvilEdward,
We've been using Audacity to convert our audio files to MP2 format. Make sure you get v1.3.x. It's available from Audacity.sourceforge.net. Here are the instructions from our docs.
Audio Software: Audacity v1.3.x
http://audacity.sourceforge.net/

• To convert your file from stereo to mono: Open your file, and then go to Tracks and select "Stereo to Mono".
• To save you file as MP2: Go to File, select Export. Click OK on the next screen, and then select MP2 in the file format drop down box. Click Options and select 128kbps. Then click save.

We've been looking for other software that would automate this process somewhat, but our next release will actually eliminate the need entirely, because we will support stereo MP3 files. Unfortunately, we can't say if that will be approved before a month from now.
- The Quixonic Team