Justin Kahn, 9to5Mac:

If Apple were to make a drum synthesizer, it would probably be dead simple so anyone can use it, while still offering up just enough control over the sounds to do some serious damage right? Probably. And that’s exactly what it just did here. But don’t be fooled by how simple its sound design controls/synth engine appears, this is just one piece of the puzzle. I initially thought that it looked way too simple to be all that useful, especially with the new Quick Sampler now in everyone’s LPX arsenal. I was wrong.

If you are interested in creating electronic music with Logic Pro, this walkthrough is worth reading.