I have a Kubuntu system which I stream amateur radio sound to via a flash interface. I want to be able to record the sound that the flash player is making at the press of a button. I also need the capability to do (hopefully real-time) spectrum analysis on the sound. I need a program (a firefox add-on would be ideal) that can do this for me.
You can try audacity. Have a look at this link -> http://www.seoras.com/2008/05/26/how-to-record-streaming-audio-with-audacity-in-ubuntu-804-hardy-heron/