USB sound card and HDMI

Hi,
I got some troubles with SoundAbout pro and an USB sound card with mic.

I´m using a RK3288 TV box in my car.
All sounds are configured to be sent by HDMI to my head unit.
BT is only used as touch control, so no real BT connection with A2DP or anything like that.
That works fine so far sound is provided by HDMI, incl. MP3, navigation commands etc.

A couple of days ago, I buyed an USB sound card and a mic, to get voice commands working on my box.
Just now I´m struggling with the needed settings to get the mic working on the USB SC together with all sound output via HDMI.

If I deactivate SoundAbout, the mic works, the USB card blinks as expected, but there is no sound output on my device, because there is no BT connection.

Is this a known issue, or do you guys have an idea how t fix this behavior?
I want to use the mic

thanks,
Peter

Download and install the latest Beta version that was just uploaded. The USB output setting is off when using HDMI, so I tried splitting the USB input to turn it on.

Restart the device after installing.

You can get the Beta versions here:
https://soundabout.forumotion.com/f8-download-beta-versions

Hmmm...
All rights are granted, but the APK installer is not able to install.
The Install button is without function. The only possibility is to cancel.

Edit:
got it installed with MobileGo...

After that I could set all needed settings and it works.
Sound card microphone and all other strange apps are working now with sound over HDMI.

Thanks a lot for your quick solution.

Excellent.