Rock Band 2 MIDI (rb2midi) is a little program can help you to use your Rock Band 2 drums as a handy MIDI controller for your digital audio workstation, and there didn't seem to be any freely available software to make this easy to do. The user interface isn't amazing, but it functions very effectively, achieving a relatively low latency.

rb2midi is now compatible with Xbox 360, Playstation and Wii drumkit peripherals for Rock Band 2.

Rock Band 2 MIDI Features:
1. Select desired MIDI output interface on startup.
2. Pick the MIDI note triggered by each pad, cymbal and pedal.
3. Control the length and velocity of triggered notes.
4. Velocity sensitivity (4 levels) for pads and cymbals.
5. Load/save settings for particular hardware or VST plugins.
6. Minimizes to system tray to avoid desktop clutter.

Here is a summary of the configuration Author use myself:
* Microsoft Windows XP (service pack 3)
* Cubase 4 Essentials
* Xbox 360 Wireless Gaming Receiver for Windows
* Xbox 360 Wireless Drum Controller for Rock Band 2
* (optional) Madcatz Triple Cymbal Expansion Kit for Rock Band 2

The license of this software is Freeware, you can free download and free use this audio utility software.