As far as I know, the MIDI functions in Sonar are mostly un-changed from those in
ProAudio9, which I've used quite a bit. If so, here is what you can do -
1. open the song in Sonar.
2. Select the drum track (10) by clicking on the track # at the left of the track window.
3. Click View, PianoRoll.
4. Double click the title bar of the track 10 Piano Roll you just opened, in order to maximise the window.
5. Using the + and - magnifying glasses in both axes, make sure the entire song is contained within the horizontal window, and that the vertical is expanded to maximum.
6. each line of the piano roll is a single drum note.
7. pick the note you want to change, click just above and to the right of the last note on the track, and draw a window around the entire line of notes on JUST THAT LINE. Release the mouse button. You have just SELECTED those notes.
8. Click Edit/Transpose, a small window will open allowing you to transpose just the notes you have selected. Pick a different drum note based on the names at the left of the Piano Roll, count the # of steps up or down to that note, and use the + and - keys in the transpose window to select that number and direction of steps. click OK. (Make sure there aren't already notes there, or you won't be able to sort the ones you put there from the ones that already were there.
9. If you want to use a different set of drum sounds, you would have to choose a different drum patch in Sonar before you make the changes above, otherwise you wouldn't know what notes would be played.
Hope this helps, maybe someone running Sonar can offer more - like I said, there's a good chance this is unchanged in Sonar so it may work... Steve