The KB series is for performance instruments, and its convenient operation panel provides users with a simple and quick operation interface.
The PSR series is a symbol of functionality and quality, offering more and more realistic tones, more popular rhythms, and a multi-track recording system, but the lower-end electronic pianos below the PSR540 are incredibly cumbersome to operate due to the lack of user-customizable user panel settings.
The DGX series is a simplified board for YAMAHA's electronic pianos above the PSR540 model, and is known for its low price and more entertaining features, but it won't make it into a professional studio.