JLCooper FaderMaster Pro - Manual (Page 49)

Writing Mutes
Using automation terminology, recording MIDI controller data
as a result of pressing Mute buttons is called "Writing Mutes".
First select the desired bank using the UP or DOWN buttons.
Then, make sure that the buttons are in MUTE mode, as
indicated by a dash next to the word MUTE.
NULL UP
SHIFT
ENABLE
MUTE
WRITING
MODE
A 1
49
A 1