This is an open source program for real-time sound effect processing. You
can use it to add some distortion to your guitar, or some reverb to your
voice. Available effects are:

    * 2 kinds of distortion (one is Ibanez TubeScreamer 9 simulation)
    * sustain
    * various flavors of reverb, echo & delay
    * chorus/flanger
    * equalizer
    * noise reduction
    * wah-wah
    * phasor
    * tremolo
    * vibrato

WWW: http://www.gnuitar.com