The scope of the Gearogs project includes things like turntables (including all-acoustic phonographs), amplifiers, speakers, mixing desks, effects including spring and plate reverbs, and microphones. It includes instruments that create their sound directly via electronic means (analog and digital synthesizers, for example), but not electro-acoustic instruments such as electric guitars, Fender Rhodes electric pianos and the like, nor electro-mechanical instruments such as the Mellotron, nor opto-electronic instruments such as the Optigan.
Common scenarios where this equipment will be found are in recording studios, hi-fi, and DJ type setups.
guitarix is a virtual guitar amplifier for Linux running on Jack Audio Connection Kit. It is free as in speech and free as in beer. The available source code allows you to build it on other UNIX-like systems too, namely BSD and MacOSX.
guitarix takes the signal from your guitar as any real amp would do: as a mono-signal from your sound card. The input is processed by a main amp and a rack-section. Both can be routed separately and deliver a processed stereo-signal via Jack. You may fill the rack with effects from more than 25 built-in modules from a simple noise gate to brain-slashing modulation f/x stuff like flanger, phaser or auto-wah.