OK, so you've made it this far. There's just one more step to make your music interactive.
Open Reason, and Create a Mixer and a RX2 player. Should look like this picture to the left.
The top part is the mixer. One of the dials (actually the one on the far left) controls the volume of the blue thing underneath it. You can add an additional 14 devices to that mixer on the top, including other mixers, making Reason virtually limitless in the number of simultaneous devices being triggered.
The only limitation to Reason is that you need to install sounds that match the file types that Reason specifies. In this case, we are using RX2 files that were created specially in Recycle for the sole purpose of being imported into Reason.
So here we go.