This library is called cut_audio. It uses ffmpeg to cut audio files in a convenient way. Version 1.0.3 added 'open' functionality so that we can edit the .rb file in question directly. Also, providing an end position is now optional. If omitted, we will simply default to the max length of the file in question. Version 1.0.6 added 'chop_off' syntax - we can now chop off from the end of the audio file. If you have specific suggestions to make this gem more useful for others, please drop me an email at: email@example.com Thank you.