In Connect Copy mode, the main machine's default [Copier / Document Server Features] is applied to the sub-machine.
However, the [Auto Tray Switching] and [Connect Copy Key Display] settings are applied to each machine separately.
If you configure the settings as follows, only the main machine's buzzer sounds when a copy job is complete.
When using the standard operation panel
Configure the buzzer volume settings under [Panel Key Sound] in [System Settings] and select [On] under [Job End Call].
When using the Smart Operation Panel
Configure the buzzer volume settings under [Sound] in [Screen Features] to set the buzzer sounding for [Operation Completed].