E-Kit Trigger is a free audio to midi VST plugin developed by TbT. Compatible OS(s): Windows.
E-Kit Trigger is designed to work with trigger mic’s such as the Redshot trigger from Clavia(Ddrum) or any Piezzo based drum pad.
It will work with pre-recorded tracks but the performance depends on the recording (the plug only analyze the amplitude,not the content).
You’ll need a soundcard that can go down to ca 3-6 ms latency if you want to get “realtime” action. The more inputs you got on your soundcard the more drums you can connect to your PC.
http://hem.bredband.net/tbtaudio/