ETC Congo Family v6.4.0 - Manual (Page 467)

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Channels - Check Mode
There is a function for stepping through a series of channels at any selected level. If a
channel is already set to a level when checked it will cut back to the previous level when the
next channel is checked.
Action Key Feedback
1. Select start channel
and set a level [#] Level_Wheel This level will be used by
check mode.
2. Activate temporary
check mode in up or
down direction [C/Alt] & [+] As long as C/Alt is held the
+ and - keys will check the
next or previous channel.
3. Exit temporary
check mode Let go of the C/Alt key.