I've got one called Audio Converter Studio 5.5 that can change the file type, bitrate, and frequency.
"There he goes. One of God's own prototypes. Some kind of high powered mutant never even considered for mass production. Too weird to live, and too rare to die."-Duke
yeh, just choose a bitrate (lower than the one the file you want to convert is obviously) and then right click on it and select, convert selection to mp3
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