Yamaha DX7 II FD Reference Manual page 33

MIDI IN control
This display allows you to program the effect of an external MIDI controller such as the
modulation wheel or foot controller of an external MIDI instrument whose MIDI Out jack
is connected to the MIDI In jack of the DX7 II.
The parameters themselves include Pmod, Amod, EGbias, and Vol. As you'll recall, these
are the same parameters as those available for foot controller 2. They perform the same
function here, except that they apply to an external MIDI controller rather than an internal
DX7 II controller. Please refer to the descriptions of these parameters above. The values
should be set
to
0 if
no external MIDI controller is connected to the MIDI In jack.
The number appearing under the display label "MIDI IN Control" is the controller
number affected by the parameter values. A list of these numbers and the controllers they
represent can be found in the MIDI 1.0 Specification published by the International MIDI
Association, 11857 Hartsook St., North Hollywood, CA 91607, (818) 505-8964.
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