Yamaha PSR-4000 - Manual (Page 111)

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F3: Controller
● INITIAL TOUCH
Sets the touch response OFF level and sensitivity
curve of the keyboard initial touch response, and
determines to which of the PSR-4000 voices touch
response will apply.
Use the OFF LEVEL LCD [▲/▼] control to set
the level at which touch response is turned off.
Use the SENSITIVITY LCD [▲/▼] controls to
select the desired sensitivity curve.
HARD 2 Requires the keys to be played very hard to produce maximum loudness.
HARD 1 Requires the keys to be played quite hard to produce maximum loudness.
NORMAL Produces a fairly “standard” keyboard response.
SOFT 1 Not a sensitivity as the “SOFT 2” setting, but maximum loudness can still be easily produced with rela-
tively light key pressure.
SOFT 2 Allows maximum loudness to be produced with very light key pressure.
Use the LEFT, R1, R2, and LEAD LCD [▲/
▼]controls to turn initial touch response control for
the corresponding parts
ON or OFF as required.