Try this: in the Staff view click Edit - Layout, then under the clef options select "Octave Treble" this should get your track notated an octave lower than it sounds. Unfortunately, I think it will apply to the entire MIDI track, so if you only need it for a section or part, it may not work. Otherwise, try the PRV for the notes you can't see in the Staff View. Not ideal, I know, but as I'm sure you know, there's a LOT that's wrong with Sonar's staff view/notation.