Let's create a short melody.
Change it to an easy-to-handle tempo.
Option + Drag (Windows: Alt + drag) to duplicate while moving the waveform.
Select the Track and display only the waveforms.
Click "All" twice to invalidate the display.
Only "volume / pitch" and "timing" are enabled.
From the display settings, check the start time and the pitch, then click [OK]. Soft by start time.
Select the Track and set the Mono flag to True.