Hi
Today we were flying a mission in multiplayer and I kinda tempted the pilot to try out the tone button.
After pressing the button (and releasing) the button, the tone did not stop. Instead it was constantly being emitted intermittently and rendered all of our radios inoperable - we were unable to talk to the tankers, ATC, carrier.
Also, the tone continued to be played with UHF-1 (and even both radios) off. Moreover, turning all electrical power off still didn't stop the tone from being emitted.
The only way of getting rid of the sound was muting the in-helmet audio (very suboptimal workaround).
My pilot was recording the bug, I'll ask him to post the video here.
The other pilots were hearing a constant tone over in-game audio that we were unable to stop. You can hear the example here: