Guitarix is a simple Linux amplifier for jackhttp://guitarix.sourceforge.net/
guitarix is a simple Linux Rock Guitar Amplifier for jack (Jack Audio Connektion Kit) with one input and two outputs. Designed to get nice thrash/metal/rock/blues guitar sounds. There are controls for bass, middle, treble, gain (in/out), compressor, preamp, tube's, drive, overdrive, oversample, anti-aliase, fuzz, balance, distortion, freeverb, impulse response, vibrato , crybaby(wah) and echo. For 'pressure' in the sound you can use the feedback and feedforward sliders.