Billy's Clavia Nord Rack 2, pic from eBay

Virtual analog synth module, same as a Nord Lead 2 without the 49-note keyboard.
[info on Vintage Synth Explorer]

Billy's Nord Rack 2 went up on the Pumpkins' official eBay account on July 13, 2011, but ended on the 23rd at $550 with the reserve not met. A Nord Modular also went up at the same time, but its reserve was not met either. The item was listed again on July 27 with a starting price of $500 and no reserve, and was won on August 3rd at $660. The accompanying text read as follows:

Nord Rack 2 Virtual Analog Synth Module. Used on Billy Corgan's 2005 The Future Embrace album and tour. Serial number: NB97050177. Unit is fully functional and comes with power cord attached. No other cords or manuals are included. Unit includes PCMCIA S-RAM 64k battery backed memory sound card containing 297 single sounds and 100 performances. A certificate of authenticity is included. Information can be found at: http://www.synthman.com/clavia/303300.html