ALESIS QS8.1 - Manual (Page 96)

Part 6: Editing Effects
90 QS7.1/QS8.1 Reference Manual
PITCH DETUNE
As its name implies, Pitch Detune takes a part of the signal and detunes it either
sharp or flat. When mixed back with the original dry signal, the popular “12 string
guitar” effect is produced, thickening the sound.
RESONATOR
This can be thought of as a highly resonant filter — or a filter that is tuned to a
specific frequency with a lot of emphasis — which causes the frequency at which the
resonator is set to be highly accentuated. This is useful for creating a brighter, buzzier,
edgier sound.
Note: when you want to control the Resonator’s output level on the Mix button [120],
adjust the Pitch effect level for that Send.