Toa M-864D Ver.2.2.0 - Manual (Page 107)

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12.1.3. Memory setting (only when the change safe function is enabled)
Set the layer for which change safe setting is enabled when the Preset memory is recalled.
Multiple layers can be set to a single Preset memory.
The background color of the selected layer number button changes to the specific color for each layer (1: Red,
2: Green, 3: Blue, 4: Yellow).
Note
Memory setting cannot be assigned to the Preset memory number at
power-on.