Ok this is just one note that I'm tuning, but you do the same thing for the whole treble clef. Each note is 3 strings, then you get down into the lower bass clef, and it's only 2 strings. When it's just two you mute one and tune the other with your machine, then mute the first and tune the second to the machine. Then the last octive, is all one string per note, and those you just tune to your machine.
The piano is totally done, and I'm going to make some cookies, and bring them and the tuning stuff back to my wonderful neighbors. We sure are lucky.