Almost a complete modular system by itself. It has six voices (and six LFOs), stereo output, and a unique mechanism for maneuvering through its wavetables. It ships with a detailed manual and a four-page cheat sheet, so you know it's serious. The wavetable editor (SphereEdit) also runs on Linux1)!
All things considered, I'm still not sure what to make of this module. It's extremely versatile—and I have made pretty sounds with it—but I feel like I need some more musical experience to really make it sing.