JLCooper FaderMaster Pro - Manual (Page 53)

The NULL LEDS
The NULL LEDs work by monitoring the MIDI data coming into
FaderMaster Pro.
When you play back a previously recorded sequence, the MIDI
data coming into FaderMaster Pro represents the previously
recorded fader levels.
FaderMaster Pro compares the previously recorded fader levels
with the position of the fader that you are moving. It lets you
know if the fader you are moving is above or below the level
of the previously recorded fader move.
If the fader you are moving is above the previously recorded
level, the up arrow NULL indicator is lit, indicating that your
fader is too high.
If the fader you are moving is below the previously recorded
level, the down arrow NULL indicator is lit, indicating that your
fader is too low.
If the two are in agreement, both NULL LEDs are lit, the fader is
at the same level as the previously recorded fader position. The
fader is said to be “nulled”.
At this point, you may enable the fader by pressing the button
above the fader, and writing your new fader move. When you
play back the sequence, the volume changes will be smooth
and continuous, with no jumps in level.
It should now also be more clear at this point as to the need for
the Enable buttons. You always want the option of being able
to move a fader into position before any MIDI data is sent.
The Enables give you the ability to turn a fader off temporarily,
thus allowing you to move them to the correct position before
editing a section of a mix.
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