From the owners manual: “The Yamaha CP25’s advanced keyboard lets you vary independent note volume according to key attack (velocity), giving you touch response strikingly similar to that of an acoustic piano. Moreover, you have a choice of dual or single sound channel operation plus four combinable filters for a vast range of tonal variation. There are also pitch, waveform and decay controls that add even greater versatility. Other features include tremolo controls, a built-in flanger, and sustain pedal capability. Whatever type of music you play–from jazz to baroque–the CP25 electronic piano gives you all the sound, versatility and response you need.”