title: Software sound cancelling (destructive interference) tools on Linux?
body: <p>I am looking at writing some software that will allow me to listen to music whilst talking with someone on skype. The problem is that if you do this with speakers the music also gets transferred to the other user, which is what I want to avoid.</p>
  
  <p>So I was thinking about writing something that will, by listening to the output of my music application, cancel out those sounds from the microphone input sent to skype.</p>
  
  <p>I have searched Google a bit, but maybe someone here can kickstart this project with some pointers/ideas/etc...</p>
  
  <p>EDIT: has anybody used <a href="http://jackaudio.org/" rel="nofollow">JACK</a> before?</p>