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The ProKeys Sono 88 portable digital piano with audio interface lets keyboard players and songwriters bridge the gap between writing, recording and performing. 88 semi-weighted, velocity-sensitive keys, advanced keybed scanning technology and a stereo-sampled emulation of a Steinway grand piano deliver an incredibly expressive piano experience. Six additional instant-access instruments and a full onboard General MIDI sound set round out a premium performance solution that can be used with or without a computer .