I was running monitors this morning and was playing around with the Key Listen function on an unused monitor mixer just in case something whacky happened, and sure enough, something did.
The good news is that it only looks like it affected what I heard in -my- ears.
So here's what I did:
Chose a random input channel, tapped post fader from Mixer 1, that had audio running through it. Lets call it Input #36. I then clicked on the Key Listen button in the dynamics section and then changed it from Self to Input #1. At that point, all I'm hearing in my ears is what I would describe as a digital version of a siren (wee-ooo-wee-ooo-wee-ooo-wee-ooo). That was strange, lets change the Key Listen channel from Input #1 to Input #2. Now all I'm hearing is a super loud tone at what I would guess is somewhere around the 3K range. I tried a few more other channels and it was a similar outcome.
I then tried the Key Listen function on a couple of other input channels, thinking something might be up with Input #36 and it was the same.
Anyone else able to replicate this odd behaviour?