Yamaha P Series P105B 88-Key Digital Piano PureCF-sampled piano: Sampled from Yamaha's own acclaimed CFIII concert grand Pianist styles: This built-In duet partner plays along with you in one of ten different playing styles. Built-In drum patterns: Basic drum patterns put the "fun" back into practicing and is a practical alternative to a metronome. Or turn your solo act into a two piece band where the drummer is always on time. 88-note, weighted GHS action: Heavier touch in the low end and lighter in the highs, just like an acoustic piano 128-note polyphony: Even when using dual Voice and split mode with a drum pattern, 128-note polyphony ensures every note gets heard.