When trying to select a melody in WhatsApp, none of them were played during the selection, including the pre-installed ones. The silent mode has been turned off. Opening / closing WhatsApp didn't help. Only reboot the smartphone helped.
foobar2000 controller doing it when it exits. For example, there is no such thing on a smartphone with MIUI, only because it does not have 4 volume sliders 🙄
But if foobar2000 controller is opened again and then minimized, then the previous volume level returns! How so? I have Bixby turned off completely. This application can capture control of the volume keys when active, but it cannot adjust the volume in the system - it was created only for remote control of the foobar2000 player running on a PC.