Voiceover volume slider is locked at 0 when using USB interface
Hi all,
Macbook Air 2020
Catalina 10.15.5
Focusrite Scarlett USB interface
I'm trying to use the voiceover feature in iMovie, but the volume control slider is locked at 0. When I switch over to the internal microphone, the slider works.
The Scarlett is selected as the input in both System Prefs and in iMovie, as well as I've checked with the security settings as iMovie has been granted access to the mic.
I've got the same issue when I try and use Garageband.
The computer does see the interface, and it works. I the meters in system prefs respond to audio when I've got the Scarlett selected, and it works AOK in Amadeus Pro.
I tried the same setup on a brand new iMac, also running 10.15.5 and the latest version of iMovie, and it's the same problem - the volume slider is frozen at 0.
Anyone else having this problem? I've just spend 20 min googling around on it, and I'm not finding any articles that are on topic.
thx!
MacBook