No audio signal - Mac Catalina?

[mark@butterill.plus.com]

No, I can’t hear my own track at all, I can just hear the jam track that I want to play along to. I know my keyboard and mic are sending a signal, I can see it at the interface but it’s simply not getting through to Jamkazam. But as I said I can get a signal through to other apps like Logic to make a recording. 

Is this a problem of 64bit Catalina OS? The app installed ok, I didn’t need to force it. It’s weird that the audio player in Jamkazam is happily getting through the interface though.