I suspect that those who posted on this thread 8 years ago have long since moved on to more modern equipment. But I've posted the following in case anyone else is using the current version of Sonar with a Korg T-series workstation.
Using a combination of the information that came with my synth (which had errors), the information in this thread, and trial/error, I have been able to make Sonar change banks on my T2.
Here is what worked for me;
1) Make sure the Global MIDI filtering seetings allow system exclusive messsages (Global 0-4, button G, toggle to "o" from "x")
2) Send the sysex commands for bank change as follows:
Bank A: F0 42 30 26 4E 02 00 F7 F0 42 30 19 4E 12 00 F7
Bank B: F0 42 30 26 4E 02 01 F7 F0 42 30 19 4E 02 10 F7
Bank C (Combinations): F0 42 30 26 4E 00 10 F7 F0 42 30 19 4E 10 00 F7
3) Follow the bank change sysex commands with a patch change command. I didn't test this exhaustively, but appears tha the patch change command must come at least 0.02 sec after the sysex command to work correctly. The only value in the patch change that seems to matter is the patch number. That number is the patch selected in the bank designated by the sysex commands.
You can insert the sysex commands manually into a track or create a sysex bank for each and enter the sysex bank command each time you need a bank change.
I'm fairly new to this so I apologize in advance if my terminology is incorrect or doesn't make sense.