EDITED - Please ignore my post below - I had not realized that the OP had mentioned SI-Drums, which cannot do what I have recommended below. Sorry for any confusion - Bob Bone
There is a CAL script that splits each drum note from a clip into its own track, HOWEVER, someone recently posted a comment about a problem with timing or something like that. I have not gone back to verify that to be an actual problem in the script - but thought I should mention it.
I do not actually recommend splitting each drum's midi note out into a separate track.
I recommend that you route each drum synth kit piece to its own audio outputs, which then get routed to a whole bunch of audio tracks in Sonar, and multiple drum buses.
EDITED: I just saw something in the other post above that I do not do in what I am typing here. I do NOT use multiple midi channels in any way for splitting drums per what I post below. There is no need. I simply take advantage of most drum synth's ability to route kit pieces to separate audio outputs, combine that with Sonar audio tracks, and buses, all with a single midi track and single midi channel (10).
Here's why:
1. Editing a drum roll becomes a nightmare, if you have to open up a different midi track for each tom tom or cymbal used in the roll/fill. I just don't think it is practical.
2. I think routing each kit piece to its own audio output from the drum synth, then routed to its own Sonar audio track makes much more sense, as you then have total sonic control over each kit piece, for volume, panning, and effects, while retaining the simplicity of editing in a single midi track.
I start with some drum kit in Battery 3 from its library, fix up whatever cells I wish to, and then change the output of each desired cell to go to its own audio output channels. Kick goes to channels 1/2, snare to 3/4, etc.
Then, I save that kit for later use in other projects, and then I create a 'Drums' track folder. In that folder I insert a single midi track, and a bunch of audio tracks, and route each of those audio tracks back to the multiple outputs from Battery 3, so that in the end, each kit piece from tge Battery 3 kit has its own Sonar stereo audio track.
THEN, I set up a series of buses, one for Toms, Snare, Kick, Cymbals, Overheads, and Room, and a Drums Main bus that all of the sub-buses feed. I change the output routing for each kit piece to go to the appropriate sub-bus, and this way I can either control individual sonic aspects of a particular kit piece, or can do the same for a whole group of kit pieces, such as Toms, or can do the same for the whole kit itself. You also group common effects for common kit pieces, in the process, etc.
Once I set up the above, I highlight and save it all off as a Track Template, so that if another later project needs the same kit, well, all of the work will have been done already, and with a couple of mouse clicks, I can pull in a fully optimized drum kit, audio tracks for each kit piece, and buses tailored for that particular kit.
It is a REALLY REALLY quick and powerful way to work with drum setup and use.
I hope I have explained the above sufficiently, give it a shot and you may decide you like it.
Bob Bone