Set audio off by default

Has anyone had success in finding a way to set camera audio to muted as a default? Mobile devices are the worst, as they always put their audio in the mix by default unless muted on the preset. I’ve taken away microphone permissions from the apps on the device, but then the app just keeps asking to get the permission back. I have an audio feed from wireless microphones through a mixer, so I don’t ever want the cameras to provide audio. I just want that one audio feed to be the only one available.

If anyone has had success in locking down the audio, I’d love to hear suggestions!