Creox project is a real-time sound processor. You can plug your electric guitar or any other musical instrument directly to the PC's sound card and start experimenting with various sound effects.
Creox has a nice user-friendly GUI, a preset support, a low-latency DSP engine and each effect parameter can be altered "on the fly".
As Creox is a JACK application, the output sound can be routed to the other JACK-aware applications, and the audio input can be taken as the output from the other JACK client.
· KDE 4 Live CD