No sound in Telegram using usb sound card

I've bought a sound card behringer u-phoria umc204hd and faced 2 issues:

First. There is no sound in Telegram. Ether in videos or voice messages. And only this application has this issue, I've tried chrome, OBS, Davinci Resolve, VLC.

Second. Sound speed is slightly slow. So the lag is about 5 sec. per minute, and it increases. I've found that it should be solved by re-enable device in pavucontrol, from time to time.

I don't know if these two issues are connected or not, but I will be happy if you help with one problem at least.

I am using Ubuntu 20.04 and tried Telegram Desktop 2.1.7, 3.2.4 from site and 3.2.2 from snap

UPD. It seems, I've fixed sound speed issues by uncommenting in /etc/pulse/daemon.conf:

 default-sample-rate = 48000
 alternate-sample-rate = 44100

But still no audio in Telegram though.

pavucontrol displays some output levels while there is no sound:

Solution 1:

This is the issue. Behringer u-phoria umc204hd has 4.0 audio - 2 separate stereo channels, but then using phones, you can get only one of them. While other apps play in both, Telegram plays only in one of them. So to fix that, you just need to switch output in phones by pressing Monitor A/B switcher on the device