Windows MP3 microphone recording tool?

 Would anyone know of a free Windows MP3 microphone recording tool that can also executed via command line?

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Dr. KlahnPrincipal Software EngineerCommented:
Comment:  Since the content and parameters of a sound file are unknown beforehand, compressing directly to MP3 is going down a one-way street.  If the resulting quality is unacceptable or the file is too large, you must re-record the whole thing.  For this reason, recording is typically done to a WAV file, then converted to MP3 later.  This allows adjusting the MP3 compression parameters so that the resulting file compresses well without overly damaging the sound quality.
genius2xAuthor Commented:
Dr. Klahn,
  Each of these voice recording sessions will be over 3 hours, I like to record those sessions as MP3s on the fly otherwise I may not have enough storage space on HD.
Dave BaldwinFixer of ProblemsCommented:
A stereo recording with Audacity at 44,100 samples per second with 32-bit float samples would require about 1.9 GByte of disc space for 3 hours.  However Audacity can record at rates as low as 8000 samples per second with 16-bit samples which would require only 173 MBytes for a 3 hour mono recording.  Audacity requires the LAME plugin for conversion to MP3.

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