Quote:
Most of the files on my empeg are encoded at lame alt preset standard.

Since you're using LAME already, If I recall correctly, LAME will accept another MP3 as input file, and will transcode for you in a single step.

If not, I'm certain that LAME can also decode to WAV using the proper command-line parameters, then you can re-encode those files to the worse bitrate.
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Tony Fabris