Roland RD-700GX Stage Piano Details. Stunning 88-key stereo multi-sampled piano sounds. 88-key weighted keyboards: PHA II Ivory Feel. SuperNATURAL electric pianos for unprecedented realism. Audio playback of WAV, AIFF, and MP3 files via USB memory. Piano Designer function for creating custom instruments. Step onstage and step up to the world’s most impressive stage pianos, with amazing pianos and EP’s onboard, plus audio-play bandmaster control features.