Hiya. I'm looking for some sort of tool where I can feed in a stereo MP3
file and have it merge the two streams into a mono MP3? (But otherwise
retaining the full quality of sound that goes in.)

I'm hoping that by losing the useless extra stream, the MP3 file could take
up less space on my flash memory card.

(I still have the original CDs if that helps.)

Many thanks.

Bill, president of cable conservation society.