Roland Stage and Studio 88 Key Digital Piano The RD-700GX was the flagship Roland piano in its day and this one is extended out with SRX boards for Ultimate Keys and Concert Piano. The 700 and 700SX are not the same. The NX has a newer keyboard but no expansion slots. Has SuperNatural Pianos, Audio Play, Master Keyboard midi implementation with 3 midi outs, multiple zones and the PHA Ivory Feel Keyboard. Stereo outs, balanced outs and USB Audio. This RD is in excellent condition and not used anywhere as much as it should be have been. The new RDs (800 & 2000) are excellent but I have to say the sounds in the 700 series are pretty nice. I find the new modelled pianos to sound a little dull but that is only my opinion! The SRX cards are still going for $300 - $700 each online and add a LOT of sounds to the base unit which is already pretty well stuffed with everything you could need unless you are a total synth-head. Comes with printed manuals and a pedal. Keyboard is in Mill Bay. If this is even close to what you are looking for you will not be disappointed.