The [+] And [–] Buttons; The Number Buttons; The Data Dial; Yes/No Confirmation - Yamaha PortaTone PSR-1700 Owner's Manual

Basic Editing Procedure
10
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The [+] and [–] buttons can be used to increment (increase by one) or dec-
rement (decrease by one) the currently selected parameter. Press the [+] button
briefly to increment the parameter value, or the [–] button to decrement. If you
hold the [+] or [–] button down, the value will increment or decrement con-
tinuously — simply release the button when the desired value has been
reached.
The number buttons — to the right of the [+] and [–] buttons — allow
direct numeric entry of the desired value, and are therefore the fastest way to
edit in many situations.
To select a voice, for example, choose one of the 128 voices — numbered
"01" through "128" — listed in the "Voice & Polyphony List" on page 77, then
enter its number using the number buttons. To select "Harmonica" (number
23), for example, first press [2] then [3]. The number "23" should then appear
on the LCD display panel along with the name "Harmnica".
The [+/–] button is used to switch between positive and negative values
with parameters that allow negative values (Transpose, Tuning, Octave, and
Pan, for example). A "–" appears before negative values on the LCD display
panel.
When selecting voice numbers the [+/–] button is used to enter the hundreds
digit of the voice number (the button alternately selects no hundreds digit or
"1"), as required, prior to entering the tens and ones digits. The [1] number
button cannot be used to enter the hundreds digit when selecting voices.
Values outside the range of the selected parameter can not be entered.
This is undoubtedly the easiest way to edit most parameters. Simply rotate
the dial clockwise to increment or counter-clockwise to decrement.