Alesis QuadraSynth Plus - EQ

Editing Effects: Chapter 7
QuadraSynth Plus Piano Reference Manual 162
The Overdrive effect provides four parameters spread across two editing
pages. It is only used in Configuration #5.
Overdrive Type
This selects one of two Overdrive Types: Soft and Hard. The Soft
Overdrive has less gain and provides slightly less distortion than
the Hard Overdrive. Also, there will still be a slight bit of
distortion when using the Soft setting, if the signal feeding the
Overdrive effect is below the Overdrive Threshold setting (see
below). The Hard setting will only provide distortion when the
signal feeding the Overdrive effect is above the Overdrive
Threshold setting.