This is an electronica geek's dream. It's basically a modular sequencing and synthesis system that works with AudioUnit instruments and effects and even live audio input. You can patch anything to anything else and control all parameters through sequencers, virtual faders, or MIDI Learn with hardware controllers. It can also control external MIDI devices. In fact, it's built for live performance, so it is surprisingly easy to quickly start doing cool things with it. You can't believe how cool Numerology is until you try it. It runs in demo mode with reasonable limitations until you register it. Still a bit rough around the edges in terms of GUI and not completely stable yet, but you can use this for real work as many others are doing, and you can do things with it you can't do any other way. It's developed one man, James Coker, who fixed a problem I had with Numerology within a few days of my report. You don't get that kind of response from big companies. Highly recommended.