How do I turn off the DRS beep sound?

In BTCC, Porsche Cup and a host of other cars, I get that annoying beep for DRS at tracks like Silverstone and Bahrain etc
All help appreciated as it’s driving me potty.
Thank you

 

I think that's a setting within Crew Chief rather than rF2....

 

Yeah that's not from rF2. Either CC, like stated above, or DRSShiftBeeps: https://forum.studio-397.com/index.php?threads/drsshiftbeeps.61555/

 

CC it must be then and would explain why I couldn’t find it in the rf2 sound settings.
Thank you for the help, much appreciated!