When you add a Drummer track to a song, a stereo Drum Kit patch is assigned:

 

If you open the Drum Kit Designer plug-in, and click on a kit piece, such as the kick drum, you have a choice of three kick drums and several adjustments to affect the sound.

 

For each stereo drum kit patch, there is a corresponding Producer Kit patch, that besides offering multi-channel mixing, allows you much more control over the sound of the drum kit. Here is the same Drum Kit in a Producer Kit patch:

 

Instead of the 3 kick drums available in the stereo kit, you can choose from among 13 kick drums. Scroll the list of kick drums to see additional choices. You also have control over whether the overhead mics pick up the kick drum, whether the kick drum picks up leakage from other kit pieces, and set an alternate room for the kick. 

 

The snare offers 15 choices (instead of 3) with all the same sound adjustments as the kick.

 

In the Producer Kit you can choose from among 8 sets of toms, whereas the stereo kit allows no tom swapping. 

 

You can choose from among 7 sets of cymbals in a Producer kit, and from among 6 Hi Hats.

 

Once you have configured your new drum kit, click the Save button at the bottom right of the Patch Library.