61-key touch response keyboard with 700 natural voices and arpeggio feature. 

• Super-realistic Cool! And Sweet! Voices 
• Control knobs for real time control 
• Arpeggio feature automatically generates chordbased phrases 
• Real-time pitch control with pitch bend wheel 
• Music Database: 305 song titles for quick keyboard setups 

The PSR-E423 offers several innovative features. The basic features for learning to play--like the Yamaha Portable Grand and Yamaha Education Suite -- and features for when it's time to perform, like synthesizer Control Knobs for real-time control of filter, effects, sound envelope and Style tempo. New colors from different musical styles can be added with 150 different patterns and 40 arpeggio Voices. These easy-to-use professional features, along with its new black body, sent this keyboard apart from others in its class.