This guide explains how to use the Yamaha PS-300 and PS-400 PortaSound instruments. It details the operation of the Orchestra section for selecting instrument voices, the Rhythm section for choosing beats, and the Auto Bass Chord section for automatic accompaniment. The PS-400 model includes additional features such as Chord Sequence Memory, Duet, and Arpeggio.
The instrument requires six 1.5V SUM-2, "C" size batteries.