Free Software command-line tools for audio playback, mastering, and whatever else related to audio. dtas follows the worse-is-better philosophy and acts as duct tape to combine existing command-line tools for flexibility and ease-of-development. dtas is currently implemented in Ruby (and some embedded shell), but may use other languages in the future.
Gemfile gem 'dtas', '~> 0.8.0'
install gem install dtas