Audacity is a free, easy-to-use, cross-platform audio editor and recorder for Windows, Mac OS X, GNU/Linux, and other operating systems.
You can use Audacity to:
- Record live audio.
- Convert tapes and records into digital recordings or CDs
- Edit Ogg Vorbis, MP3, and WAV sound files.
- Cut, copy, splice, and mix sounds together.
- Change the speed or pitch of a recording.
Exporting audio as an MP3 is easy to do in Audacity and uses LAME as the in-built encoder. If you want to make use of extra LAME settings, such as the lowpass setting, then you'll need to do the following:
File > Export > Save as type: (external program)
Then in the Format Options > Command: field enter:
C:\Path\To\Lame\lame.exe - -V 0 --lowpass 16 "%f"
Be sure to change the "C:\Path\To\Lame\" to where the lame.exe is actually located on your computer.