Toa DP-K1 - Manual (Page 91)

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19.3.3. Output mute function
Assign the mute function ON/OFF to the terminal.
Step 1. Press each channel's Function button to select "Mute" from the pull-down menu.
Step 2. Press the Control button to select "Make" or "Pulse" from the pull-down menu.
Step 3. Click the channel button(s) to be muted in Output Channel/Contact selection.
Note
In the "Pulse" control method, the mute ON/OFF status controlled by the D-981 or D-983 is not stored in any
preset memory.