Congratulations on purchasing the Yamaha Portalone PSR-90. This ultra-modern keyboard utilizes the latest digital technology to provide a wide variety of sounds and accompaniments. The manual guides you through setting up the instrument, including inserting batteries or connecting power adaptors like the PA-4 for household current.
The guide covers major features such as the Orchestra Section, Solo Section, PCM Rhythm Section with a built-in drummer, and Auto Bass Chord accompaniment. It also details how to use the transposer and pitch controls, create custom accompaniments, manage registration memory, and utilize the Multitrack Recording System (Music Programmer).