Here is a dope little tutorial I watched the other day on Side Chain Compression for Reason. The idea can also be applied to other DAWs , but you will have to figure how you can do it with that program. Side Chaining is a great way to let Kicks pulse over top of bass or instruments. You are triggering compression every time one sound plays and applying it to another sound or sounds so that the triggering sound can be heard more, or to create an effect on the beat. Have Fun, I did!!!
This Video Shows How To Set Up A Quick Side Chain
This Video Will Give A Good Idea Of How Side Chaining Effects Your Sound, also shows Set Up