I use a drum plug-in with Garage Band called EZDrummer. I want to create my own drum arrangement from scratch instead of looping in presets. Past recording softwares I've used had a "drum map" or a grid where I click in boxes where I want the drum sounds to go at which time measures. I can create the entire drum squence before i start recording and then use EZD as the sound output. Obviously, this is different from recording drums live via a midi keyboard (which I don't have). Is this possible in Garage Band?