Yamaha DX7 II FD Reference Manual page 39

Mode There are four pan modes available in the dual or split voice modes. Mode 0 is
automatically selected for single voice mode. These pan modes are described below.
0:
Mix
The sound of voice A (mixed with Bin dual or split voice mode)
is sent equally to both audio outputs. The panning function
(#2 above) operates in this setting only. This allows the sound to
be moved in the stereo field between the audio output jacks
according to the selected factor described below.
1:
A;
on
B;
on Both voices are sent independently to their respective audio
outputs, NMix and B. The level control function (#3 above) is
operative for both voices.
2:
A;
on
B;
off Both voices are sent independently to their respective audio
outputs. The level control function (#3 above) is operative for
voice A only.
3 :
A ;
off
B ;
on Both voices are sent independently to their respective audio
outputs. The level control function (#3 above) is operative for
voice B only.
Range
Range determines the intensity of the effect programmed with the select parameter
described below.
0 Disables selected effect.
99 Intensity of selected effect is maximum.
Select This parameter determines which of the available effects will be applied to the panning
function (available only in pan mode 0) or the level function (available in pan modes 1-3).
L
F
0 The selected function (panning or level) is controlled by the LFO of
the voice used (in the dual and split voice modes, the LFO of voice
A). The apparent location of the sounds varies between the two
outputs periodically with the frequency and waveform of the LFO.
V e 1 o c
i ty
The selected function is controlled by the velocity with which you
play the keys, in the following ways:
Key Panning Function
Level Function
Velocity
_{PAN MODE=
Ol
j_PAN MODE = 1 -
31
Slower
Greater audio output Greater audio output of
from the A/MIX jack voice A from the A/MIX jack
Faster
Greater audio output Greater audio output of
from the B jack voice B from the B jack
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