Completely disable join/leave sounds for conference bridge

Is there a way to completely disable any join/leave sounds on a conference bridge? We’re running FreePBX distro 5.211.65-21. Asterisk version FreePBX version Any help is greatly appreciated.

if you are using confbridge: Quiet Mode

Doubt it on Asterisk 1.8.

Awesome. Thank you, sir. I should have just read the tooltips. Many, many thanks.