Yep... what Jim said.
I've never used it in this manner, but I know a bunch of folks in this forum have used MC through the years to trigger drum synths and other midi modules so they could record the audio output back into MC an an audio track. Most of those were wanting to record the sounds in their midi keyboards back in as audio.
You can even have multiple midi channels going to various hardware midi modules if I understand this correctly. Put your drums on channel 10, the piano on channel 9 etc... and daisy chain the modules.
All that aside.... if you are still writing drum tracks on an external hardware drum machine, you should really take a look at some of the software based drum VSTi's. They make creating drum tracks sooooo much easier. I used to write them the same way you do.... but I switched to software based synths. Some will even create the tracks for you according to the style and groove you want. One of my early favorites was Jamstix. Select a kit from dozens of default kits or import them from other drum synths, select your drummer based on his style (modeled after real live drummers you've heard of), select a style of music, and JS will create a fully editable track for you. JS is just one of several really nice, and easy to use drum synths available. And they sound really nice too.
You should already have some synths included with MC6 that might be workable if you take the time to work with them a bit.