Same issue in 2020
An update either on PSXT side or MSFS messed up the audio. I fly out of KORD often. I have it set at 50%. Its always been that way. I use FSLTL library. Never changed it. When I load up PSXT, once it loads all of the traffic, I suddenly have no MSFS sounds, no menu, no cockpit, nothing. I hear plenty of AI, as I always have. As soon as I close PSXT, I have MSFS sounds again. I don't know what the limits are or how the two programs communicate, but what I do know to be fact:
PSXT not running, MSFS sounds.
PSXT running, No MSFS sounds.
I have since reduced traffic to 25%. No change in audio problem, but when I close PSXT.... voila!
Oh... and yes, all of my audio settings are correct. Is there something in the parameters or are we blaming this on MSFS.
Also, my sound issue is more recent than previous posts in this thread. I was not having any issues at the beginning of June.
Here is a link to a recording of my issue: https://screenrec.com/share/COB3A7MiXv