[idea] Configurable notification sound volume

[meganemura]

idea / problem

The built-in notification sounds are a bit too loud for me.
Right now, the only way to change the volume is to replace the mp3 files with [ui.sound] path. This works, but I have to re-encode the files every time I want to change the volume.

requested change

A volume setting in [ui.sound], like this:

[ui.sound]
volume = 50  # 0-100

Herdr plays sounds with afplay, Windows MediaPlayer, or one of paplay/pw-play/ffplay/mpg123/mpv. All of these players have a volume option.
So herdr can pass this setting to each player.
The exact name and format are up to you.

why you want this

I can keep the default sounds and just make them quieter. I also don't need to keep my own re-encoded mp3 files.

[cloudant42]

Already added a sheep sound :) ... just a bit too loud in the office and too lazy to edit the mp3. Would be a nice feature!