I'm looking for drum software to run on my Mac. I have iDrum and it is great for loading up my own drum samples and programing patterns in step mode but it is horrible for arranging patterns into songs. I tried a demo of RS-16x and it is great for arranging songs but it only programs patterns in real time. it's to frustrating trying to tap a snare fill with mouse clicks. The software MUST be able to load up my own drum samples. I don't need any factory provided drum samples. Patterns must be able to be programmed in step mode. and must have a good song arranging interface. thanks for any suggestions.