Use your Rock Band 2 wireless drumkit as a MIDI controller. rb2midi works very effectively for a simple utility program, achieving a relatively low latency.

rb2midi 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

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