"Catch" the fundamental of the signal in Treemonster's graphical interface by adjusting the low/high frequency cutoffs and setting the threshold appropriately. In the Wet FX slot of Treemonster you'll find a device named "Display" having a Pitch-12 modulator that displays the pitch. For fine adjustment play with the "Average" button, the Average Time ("Avg Time") and the "Quantize" button.

I have improved the previous "tuner device" and added a description how to use it.

Bitwig's native tuner