Audio-Technica ATDM-0604a 6-Channel Digital SmartMixer - Manual (Page 70)

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Key functions
Ducking function
The mixer has a ducking function on input channel ST.
The function automatically reduces the background music volume
or returns it to the original volume. It is useful for situations in which
background music is playing and there are announcements to be made.
Enabling Ducking
1. Start Web Remote and log in as “Administrator”.
2. Click “Ducking”.
3. Click on "Enabled"
• The signal assigned to BUS1 becomes the trigger, and ducking is applied
to input channel ST.