Yamaha’s DGX-640 was designed to be as close to a piano as a Portable Grand can be with its 88-key weighted Graded Hammer Standard keyboard action and wide selection of piano voices. Packed with sounds, the DGX640 has over 500 different sounds to choose from. You can switch to violin, or harp, or guitar or any of the other 500 different sounds and seriously change the mood of your playing. This piano is a sturdy piano, and when you play the weighted keys you really get a good feel for what an acoustic piano prides itself on. The Yamaha DGX-640 comes in two beautiful finishes, a darker, walnut wooden finish and a lighter, cherry wooden finish. Both give a striking, deluxe feel to the piano, and the matching piano stand will come in the same exact color. The DGX640 also comes with a built in 6 track recorder with option to save tracks on the internal storage or on a USB.
According to several user reviews, they have praised Yamaha DGX-640 for the easy to use; realistic sound; responsive / good action; touch sensitive keys; pre-programmed music; It will also comes at an affordable price, and can even be purchased in a bundle that includes headphones, a stand, a bench and much more. Also, some users have complained it for the plastic construction feels a bit cheap; This headphone output is on the back of the unit and a bit hard to find and plug in headphones.
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To restoring Yamaha DGX640 to it’s factory settings, just simply power ON while simultaneously holding the Highest White Key on the keyboard.
Warning! This function erases all backup data in the instrument’s flash memory and restores the initial default settings. Before you perform this operation, check whether there is any data you want to keep. Hopefully the article of “Reset Yamaha DGX 640 88 Key Digital Piano” can help you.
Reference: Yamaha DGX 640 manual