ok first, u will ned the following:
- Quick Time Player
- a song or any audio whithout video (.rm, .mp3, "not sure about others")
steps:
open the audio file using Quick timePlyr
then file -> export
export as (movie to 3G) although its not a movie but it changed my .mp3 which was 5.8Mb to .3gp which made it 350Kb
which is pretty good
salam ...