Disable sound from NotificationChannel

Question

Today I started targeting API 26 which forced me to use Notification Channels.

My problem is that now on each new notification (including updates to it) an annoying

Answer 1

As IMPORTANCE solution has the side effect of no notification popup, I got a final solution is:

1. adding a silent sound resource which downloaded from below repo
2. set sound for the channel with the silent sound resource.

https://github.com/anars/blank-audio/blob/master/1-second-of-silence.mp3