Yamaha DX7 II FD Reference Manual page 44

Key
When using presets 2-5, the actual tuning will vary according to the key in which the
music is played. This parameter allows you to select any one of the twelve available
keys for music to be played with one of these presets.
AlB These two parameters turn the microtuning function on and off individually for each
voice. Turning the microtuning function off automatically sets the voice to equal
temperament. Turning it on applies the microtuning specified by the table select
parameter to the voice. In single voice mode, you need only to turn on the A parameter
to apply the selected microtuning.
Note shift
AlB This parameter lets you shift or transpose the pitch of the entire keyboard for either or
both of the voices. It can be applied to each voice individually.
EG forced damp
-24 Shift the pitch down by 24 semitones (2 octaves).
0 No pitch shift.
+24 Shift the pitch up by 24 semitones (2 octaves).
When shifting the pitch in the single voice mode, use the A parameter to specify the
transposition.
As you know, the DX7 II is a 16 voice polyphonic instrument capable of playing as many
as 16 notes simultaneously in single or split voice mode. In dual mode, up to 8 notes can
be played together. In this case, and when using the sustain pedal, the number of notes
you
try
to play may exceed the number of notes playable by the instrument.
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