PSR E 223

·         Total of 375 high-quality instrument voices and 100 accompaniment styles

·         Portable Grand button lets you instantly call up Yamaha’s world-famous grand piano sound

·         Yamaha Education Suite (Y.E.S.) feature

·         102 built-in songs for easy learning

·         Reverb effect with 9 different reverb types

·         YKS 1000 Stand and Adaptor not included

·         Delivery in 1-2 Weeks

PSR E 423

·         Control Knobs, Arpeggiator and Pitch Bend

·         Improved Arpeggio Function

·         A variety of New Dynamic Voices

·         Extended Flash Memory, Connectivity to PC via USB

·         Stand and adaptor not included

·         Delivery in 1-2 weeks

DGX 640

·         Graded Hammer Standard (GHS) Keyboard with matte finish of black keys

·         Amazingly realistic and dynamic sounds

·         Live!  Cool! And Sweet! Voices

·         Digital Signal Processor (DSP)

·         Easy song arranger

·         Performance Assistant Technology (P.A.T.)

·         Music Database plus External Files

·         USB TO DEVICE; USB TO HOST

·         Easy performance with music notation display

·         Yamaha Education Suite (Y.E.S.)

·         Optional three-pedal unit (LP-7A)

·         Includes pedal and stand; bench not included

·         Delivery in 1-2 weeks