Jules Lewis wrote:
> I don't know if 'clipping' is the right word, but there are a few
> MP3's that I have tried importing into Audacity that seem to be too
> 'loud' for the software. When playing it back, there are some
> clicking noises, like when you overload a speaker...
Yes, this is caused by clipping. The clipping was probably created by
the MP3 encoder. The output of MP3 encoding is always slightly
different than the input, and sometimes these slight differences cause
the output to exceed the maximum available volume.
> If I reduce the volume on the tracks in Audacity after they are
> imported, the 'clipping' is still there. Is there any way of adjusting
> the volume at the import stage?
The MAD MP3 decoder has an automatic attenuation feature that can
prevent clipping by automatically reducing the volume of the MP3 file
as it is decoded. I believe you will need to use the command-line
"madplay" program (or a Windows front-end) to use this feature:
MAD for Windows: http://home.wanadoo.nl/~w.speek/mad_frontend.htm
The best solution, however, is to extract from the original audio CD
into WAV format (which is uncompressed and will not have any clipping or
other distortion), and do all of your editing on the uncompressed file.
After you are done editing, encode the final results to MP3. If the
resulting MP3 file has any clipping, then use the Amplify command to
lower the volume slightly before encoding.
> I am using version 1.0.0, by the way.
You may want to upgrade to Audacity 1.2.0-pre3. In Audacity 1.2,
clipping still causes some distortion, but it is much less audible
than the loud static-like noises caused in Audacity 1.0.