How to show volume level when changing sound volume using custom shortcuts.

Question

On Ubuntu when changing sound volume with keyboard it increasing or decreasing too much for me (something like 5% or 10%).

I wanted to change the volume with 1% every time keyboard button is pressed.

So I assigned custom shortcuts for a command amixer -D pulse sset Master 1%+

But now, when I use those buttons I don't see a box notifying about the current sound level. How do I invoke it?