Highlight chosen audio output and microphone settings

[hecto600]

Is your feature request related to a problem? Please describe.

1. No indication of which audio output device is being used
   
2. An audio input GUI control

Describe the solution you'd like

1. A check mark showing which is the current one
   
2. Like with the audio output but for microphones
   

[nwg-piotr]

I added a check mark before the running sink name.

If it comes to microphones, I have no idea where even to start from.

[hecto600]

Idk if it's useful but here are some pactl commands related to mic:

• toggle mute: pactl set-source-mute @DEFAULT_SOURCE@ toggle
• set a volume: pactl set-source-volume @DEFAULT_SOURCE@ 75%
• raisee volume: pactl set-source-volume @DEFAULT_SOURCE@ +10%
• decrease volume with index: pactl set-source-volume 65 -10%
• get default: pactl get-default-source

PS:
play an audio: canberra-gtk-play -i audio-volume-change
it would be cool to have an audio feedback after volume change for sink and source

[nwg-piotr]

Probably it's doable with pactl. I'll try one day. Will need a 6-pack, I'm afraid. ;)