Sony FX6 Audio Distortion through ATEM TV Studio Pro 4K

First time question...

I'm using a Sony FX6 and ATEM Television Studio Pro 4K

When I use the 1080p x 1920p SDI / 1080p x 1920p HDMI (camera menu is set to MONITORING) the audio is very clean listening through the switcher via headphones.

When I change the settings to 2160 x 3840p SDI /1080p x 1920p HDMI I get audio distortion listening through the switcher via headphones

In both cases SDI is outputting from the camera into the switcher.
There is no audio distortion when listening through the camera so this must be on the switcher side.

Ideally, I would like to send the 4k output from camera into the switcher without audio distortion.

The good new is the 4K switcher upscales the 1080p video to 4K and the audio is fine in this instance.

Has anybody had the same issue and found a solution?

Hi, Alan.

Did you resolve this issue? How did you resolve it?

I got this same issue using Atem Production Studio 4K. SDI Audio embedded is distorted in 4K. In FullHD works fine.

Thanks.

Robson