The Yamaha DGX 640 is the big brother of the Yamaha DGX 530 and is overall the superior instrument. The DGX 640 comes with a 88-key Graded Hammer Sta for Sale in
Yamaha DGX-660 vs DGX-640: A DGX Comparison
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Yamaha DGX-640 Portable Grand Piano Complete Bundle (Walnut)
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Yamaha DGX 640 88 Weighted Key Grand Piano, Local Pickup or Delivery Bronx 10461 | eBay
Yamaha DGX-640 Portable Grand Piano w/ sustain pedal and power supply 2010-2013 Silver | Reverb
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Yamaha DGX-660 vs DGX-640: A DGX Comparison
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