sween555 wrote: ↑Tue Aug 25, 2020 7:46 am
I'm running a soundcraft Signature 22 mixer into Mojave 10.5
I've split your question from the thread where you posted as this clearly has nothing to do with Catalina (the subject of the original topic).
sween555 wrote: ↑Tue Aug 25, 2020 7:46 am
I'm running a soundcraft Signature 22 mixer into Mojave 10.5, Audacity can see it on drop down but will not play any sound. When I use a focusrite mixer, it can see that and play the sound.
Please describe exactly what you are doing. It is not clear whether you have the Soundcraft mixer and the "focusrite mixer" connected at the same time, or what exact settings you have in the
Device Toolbar, or whether you are reporting a playback issue only, or whether the problem affects recording also, or how the equipment is set up, or which USB socket you are using, or how you are routing the USB to your headphones....
You will need to give us a clear and detailed picture of what your setup is, how it is configured, what you are trying to do, and what is actually happening.
sween555 wrote: ↑Tue Aug 25, 2020 7:46 am
a focusrite mixer
What is a "focusrite mixer"? I thought that focusrite only made audio interfaces, not mixers.
sween555 wrote: ↑Tue Aug 25, 2020 7:46 am
Audacity can see it on drop down but will not play any sound
...
Quicktime player can see the soundcraft mixer and can record sound from it
So are you asking about playback or recording?
sween555 wrote: ↑Tue Aug 25, 2020 7:46 am
Incidently, the same thing happens with audacity on my macbook pro, running the same IOS

"IOS" is a mobile operating system. Do you mean that your mackbook pro is also running "macOS Mojave"?
sween555 wrote: ↑Tue Aug 25, 2020 7:46 am
Mojave 10.5
What is "Mojave 10.5"?
"Mojave" is the code name for macOS 10.14.