3/29    anyone know of any (hopefully opensource) libraries out there
        that I could use to manipulate mp3's? I'm thinking of like
        appending one onto another, merging one on top of another w/
        adjusted volumes, etc. thanks                   - rory
        \_ I don't know about libraries, but Audacity is open-source and on
           sourceforge.  It can do everything you need except I'm not sure
           how to call it as a library.  I believe it requires you to have an
           MP3 codec already installed on your machine, which shouldn't be a
           big hurdle. see http://sourceforge.net/projects/audacity
        \_ you can concatenate and adjust the volume of your mp3s by
           converting them to WAV with sox.  it's probably easier
           just to use audacity, it's kind of like a cheap version
           of ProTools without a lot of the features you will never use.
           there's a program out there I think called normalize that
           will take a bunch of WAV files and determine an average
           loudness and adjust the volume of all of them. - danh
        \_ I think foobar2000 has extensions to do a lot of this
           (built-in replaygain written to the tags for volume adjustment,
           which is great)
        \_ ecasound http://www.eca.cx/ecasound
           \_ this is fantastic. thank you.     - rory
        \_ Are you on a Mac? If so, you can use CoreAudio do to do all
           this. I've written an ObjC wrapper that can read all supported
           file formats (AIFF/WAV/SDII/MP3/AAC, etc.) and has a model that
           makes it simple to write your own processing algorithsm. Plus,
           you can use any existing AudioUnits (OS X ships with a nice
           compressor, EQ, reverb, and other effects). Mail me if you want
           the code.  - ciyer