In place of the physical controllers in the original TiberSynth, there is a 2D playing surface which is mapped to a 2D random parameter space. The circles on the playing surface represent individual synthesis parameters, which scale based on your distance from them. This mapping scheme is based on work done with Jeff Carey for the Dozen Dimensions Duo project.
Enough talk; go here, turn up the speakers, and drag your mouse around: tibersynth.prtcl.cc. Enjoy.