JLCooper FaderMaster Pro - Manual (Page 36)

Null Button (In the P Banks)
There may be situations where you wish to move a fader to a
certain position, without sending any MIDI commands.
Using the Snapshot feature (described on the previous page),
you may want FaderMaster Pro to send out specific values of
MIDI commands, without having to move the faders and send
out all sorts of intermediate values.
For example, if you just want a single MIDI Program Change to
go out, say, 48, you may not want to move the fader and end
up sending 1 through 48.
Hold the NULL button before moving a fader, and keep it held
down. Then, when you move the fader, FaderMaster Pro will
not send out any MIDI commands.
You can still observe the current value of the fader in the
display.
Then, when you are ready to send MIDI commands, release
the NULL button.
To send a MIDI command, either move a fader a little bit, or
press SHIFT SNAP to send a Snapshot of the current values of
all eight faders.
The NULL LEDs are use in the A Banks for automated mixing,
and are not used in the P Banks.
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