FxSound only reacts to windows "notification" sounds

So i just downloaded FxSound for the very first time. I am runnin version v.1.1.28.0 on windows 10. And i have my output device selected and all. But the long red audioline in FxSound application only reacts to windows notification sound, not like spotify music and youtube videos.

Please help, what to do!

Sorry about this. What is your playback device set to in Windows?

How do i answer to that? My headphones, are (realtek high definition audio and set to playback device.

is there any possibility to voice call for help? Like discord?

Can you please check if the volume is reduced in system volume mixer.