Yamaha P115 88 Weighted Key Digital Piano Bundle with Knox Double X Stand, Knox Large Bench and Sustain Pedal Bundle includes Yamaha P115B 88-Key Graded Hammer Standard Digital Piano with Knox Keyboard Stand and Knox Bench 192-note polyphony ensures the suppression of dropped notes even with simultaneous Dual and Split modes and a drum pattern playing Intelligent Acoustic Control provides full, balanced sound that adapts to each user's volume setting for the best possible tone at any level Duo mode allows for side-by-side piano practice. Ideal for schools teaching group lessons, it accommodates two students per piano. New Digital Piano controller app.