Four clicks count you in; the take starts on the fifth, so none of the count is recorded. Pitch is resolved with the YIN autocorrelation estimator, then quantized against the tempo above — sixteenths and triplets alike, each beat read as straight or swung from how you played it. The key spells the notes and sets the signature; the instrument writes the part at the interval it reads, so a line hummed in concert C comes out in D for trumpet. Turn Chords on for guitar and the harmony is read as well as the line — chord names over the staff, Roman numerals under it, in the key you set or the one it hears. The score is set on the clef you pick, or Auto to read it from your range. Use headphones with the metronome on, or the click is recorded along with the line.