Maestro Pro
Annotating
Mark up the page like a paper part.
Drawing on the page
Turn on Annotate in the toolbar and draw with Apple Pencil using the tool palette: pens, markers, pencil, colours and an eraser. Ink is saved with the score and shows while you play.
Each zoom size keeps its own drawing so it stays lined up with the music.
Export as PDF and Print include your ink for the key and zoom you are viewing.