Hello MountainSide,

You can select Harmony | Thru harmony , and select #147 Octave below - Generic | and this should allow you to change just the Thru track to a lower octave.
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Alternatively, if you are using a MIDI input device that has a control for register (could be labeled as OCT+/- or 8va/8vb) you can adjust to a lower octave on your device.

Hope that helps!


Best,

Jerry