The Yamaha HA-1 is an electronic keyboard featuring 25 instrument voices selectable via buttons. The manual details how to power on the unit, adjust the master volume, and select between upper and lower voice banks.
Key features include five basic practice voices (String Ensemble, Piano Sound, Brass Ensemble, Cosmic Sound, and Synthesizer Sound) and various performance controls such as Vibrato, Touch, Sustain, Expression pedal integration, and Pitch adjustment.
A maximum of seven notes can be sounded at the same time.
Some units may lose some user programmed data, but factory programmed memories will not be affected.
This control lets you adjust the overall volume of the HA-1.