I added a new tutorial today describing how to use a simple sine wave to enhance your kick drum sounds.  The tutorial is based on the on located on the AudioTutsPlus website (http://audio.tutsplus.com/tutorials/mixing-mastering/enhancing-the-kick-drum-with-sine-waves/).  I created a tool called "Kick in-hancer to help with this task.  I will post the Kick In-hancer vst plugin soon so you can try it out if you like.  Check out my tutorial on the VST and Music Creation page of this website.