"Richard Crowley" writes:

"mcp6453" wrote ...
When I edit an MP3 file in Cool Edit 2000, is it edited
AS an MP3 file or is it internally converted to a wave
and then compressed BACK into an MP3?

The answer is as close as the help menu...
"As an .mp3 file is opend, it's decompressed into Cool
Edit Pro's uncompressed internal format..."

This internal format is most likely identical to ".wav",
perhaps at 24-bit resolution (speculation).

I could be wrong, but I thought the internal format was
floating-point.
--
% Randy Yates % "And all that I can do
%% Fuquay-Varina, NC % is say I'm sorry,
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