11 ms·I've got an SK-1 and it is indeed 2-note polyphonic.by bzzzt 5y agoI've got an SK-1 and it is indeed 2-note polyphonic.dmicah 5y agoSK-1 has 4 note polyphonybzzzt 5y agoJust looked it up and you're right. The polyphony drops to 2 notes when using the 'auto accompaniment' function though.