This is a Little program I wrote because I wanted to use my Rock Band 2 drums as a handy MIDI controller for my 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.
The basic features are as follows:
Select desired MIDI output interface on startup.
Pick the MIDI note triggered by each pad, cymbal and pedal.
Control the length and velocity of triggered notes.
Velocity sensitivity (4 levels) for pads and cymbals.
Load/save settings for particular hardware or VST plugins.
Minimizes to system tray to avoid desktop clutter.