JLCooper ES-4/100 MIDI - Manual (Page 9)

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have a HUI emulation mode that is compatible with Pro Tools and
other applications that support the HUI controller.
Operation
Faders
Since there are only 4 physical faders, only 4 faders can be
manipulated and shown at any time. The use of all 8 faders is
accomplished through “bank switching”. The faders are arranged
in two groups of 4 faders. The Inc/Dec button selects the bank to
make active. When the unit is first powered on, Bank 1 (faders 1-
4) is active. When the INC button is pressed, Bank 2 (faders 5-8)
is active. Bank 1 can be selected by pressing the DEC button.
The ES-4/100 and ES-8/100 internally keeps track of all 8 faders.
For example, if the INC button is pressed, the ES-4/100 and ES-
8/100 will remember the settings of Faders 1-4. Pressing the DEC
button will restore the faders to their original positions.
Additionally, if the computer or MIDI gear made updates to the
fader position, those positions would be remember even if they
were part of a bank that was not currently selected.
This also holds true for the LEDs above the faders. The ES-4/100
and ES-8/100 will remember the settings of the LEDs when the
banks are changed.