Hi Jeff!

All right, now I've got it. I know exactly what you're talking about!

This is basically tuning to a note...

First, set the mode to pattern play.
Then, while you hold the pitch mode button down, press the key in which you want the note's pitch to be. (A, B, C, etc.)
And, finally, adjust the tune of the note with the tuning knob to the pitch of the external source.

And there you have it!
I hope this is the information you were asking for.

Okay, bye!
Jessica