As long as you don't expect it to be a typical well-behaved VA suitable for leads and plucks etc., XORbot can be great fun for lovers of exploration.. finding sudden complex resonances and rhythmic patterns emerging out of what are essentially relatively simple ingredients kept me glued to settings-tweaking for a good long time.
Capable of evoking good ol' analog "electronic tonalities" Krellishness, or the more modern naked-binary-flavored madness, should one wish.
Much thanks to FSA for XORbot- I'll try my best to dial in some presets that give hint to the depths possible at some near point in the future.
Minus one star for not allowing MIDI notes to affect the sound.. I'd love to, for instance, have a toggle for "MIDI note to: (0 to 1)(-1 to 1)" conversion, as to potentially unlock yet more madness within these Boolean-based buddies (go grab NANDroid, it's awesome too).