I saw both models at Best Buy today. . . The 500 has a floppy drive (1. 44MB) and the 505 takes a flash memory card. . . . Dont know anymore. . . . . . . . . Lrelec
I just got the DGX 500 on sale for $400 bucks! I sold a YPR 50 for $200 and paied $349. What an upgrade. I've done some research and as far as difference between the two, it's hard to tell when you look at them because they look alike. A major feature difference between the 2 models is the DGX 500 has 619 voices whereas the 505 peaks at 494. From what I can gather the standard features of the 2 vare the same, except as noted with the 505 having smart media storage. I love this keyboard! It makes me want to learn how to play.