Yamaha's top technicians selected a CFIIIS concert grand piano with exceptional sound quality, then tuned it with the utmost care. They then used our unique "Pure CF Sampling" technique to sample this fabulous sound to achieve the piano sound of the CLP/CVP. This is how you can enjoy such a pure sound on your instrument.AWM (Advanced Waveform Memory) is a technology that digitizes sounds from real acoustic instruments to obtain high-quality samples, which are then digitally processed. On a piano, not only the power, but also the timbre of the same note varies with the strength of the strike, from pianissimo to fortissimo. AWM Dynamic Stereo Sampling technology makes it possible to recreate these subtle dynamic nuances by recording samples at different strike forces. The more samples are used, the more expressive quality and potential becomes apparent.If you close your eyes while playing a grand piano, you'll discover that its sound is a little more complicated than "note-on-note-off. Yamaha has gone to great lengths to capture these sonic artifacts in the P-155. These meticulous efforts include recording a felt damper that lands on a vibrating string when a note is released (Key Off Samples), or reproducing the sound of the open strings that invade your playing when you use the damper pedal (Stereo Sustain Samples and Damper Resonance).You can select a tone from a wide range of other instruments sampled in stereo, and enjoy extraordinary realism in your musical performances.Like a grand piano, the GH mechanism allows for a distribution of key weight according to the tessitura: heavier in the bass and lighter in the treble.By simply connecting a USB key to your instrument, it will play your favorite songs in MIDI format in order or randomly.By connecting a USB stick to your instrument, you can save and reload your settings and songs created on the instrument.This instrument uses an extremely powerful amplification system that provides outstanding performance for such a lightweight digital piano. With 12 watts per channel, this keyboard can follow you wherever you go.For your enjoyment, a selection of 50 songs is offered. They were chosen because they are among the most studied pieces of the classical repertoire.