Alesis PRESTIGE Guide D'utilisation page 11

Pedal Resonance
Pedal resonance is a function that simulates the reverberation of
notes when pressing the sustain pedal on an actual piano. With Pedal
Resonance enabled, Prestige reproduces the rich harmonics and
unique sound characteristics of an actual piano when using a sustain
pedal.
To turn Pedal Resonance On/Off, press and hold Key Function,
and then press the F#7 key.
Lesson Mode
The Lesson Mode feature divides the keyboard into two zones with
the same pitch and voice. This enables both the student and teacher
to easily watch and/or play together during instruction without having
to move away from the piano and take turns or having to reach over
each other to play the same pitch.
Note: In Lesson Mode, the Layer and Split Modes will be
automatically disabled.
Note: Lesson Mode cannot be selected during Demo playback.
To turn Lesson Mode On/Off, press and hold Key Function, and
then press the F7 key.
11