Alesis QuadraSynth Plus Reference Manual page 27

Your First Session With The QuadraSynth Plus: Chapter 2
Note: If a Sound is not enabled in a Program, its title will be shown in lowercase
("snd4"), and adjust its controls will have no effect on the Sound until the
Sound is enabled. To enable a Sound, hold down its respective Quad Button
(i.e., [3] for Sound #3) and press VALUE [ ].
QuadraSynth Plus Piano Reference Manual 28