cajun,

I posted this a while back and am reposting it here:

1. Go to the piano roll window and click on the "B" bass track button.
2. Right click anywhere in the grid and select "Select All Note Events."
(They should now all appear red in color.)
3. Now move the mouse cursor to the center of any note until you see an up-and-down arrow.
4. Now hold down the shift key and drag the note to the desired pitch, all the note should move.
5. The bass track is still frozen but now you have transposed all the notes.

Hope that helps,
Ed