https://wiki.ubuntu.com/Sound#Sound_menu discusses the behavior for
scrolling on the volume menuitem and scrolling on the title:

> Whenever the volume item is highlighted:
>
> The Left and Right arrow keys should instantly decrease or
> increase the volume, respectively, to the nearest 5 percent step.
>
> The “-” and “+” keys should instantly decrease or increase the volume,
> respectively, to the nearest 5 percent step.
>
> Rolling a mousewheel up or down should increase or decrease the 
> volume respectively, 10% per click.

and

> As a hidden treasure, when the pointer is over the title, whether
> the menu is open or not, clicking a mousewheel up or down should
> increase or decrease the volume respectively, to the nearest
> 10-percent step. 

By my count, the volume menuitem seems to be correctly following the
spec, requiring 10 mouse nudges to go from 0% to 100% volume.

The title takes something like 16-17 nudges, so the IMO the right way to
make scrolling consistent between the two is to make title scrolling
follow the spec.

There is a second bug here that intersects with bug #1226931: the
left/right and -/+ keys don't follow the spec at all, so there's
currently no simple way to walk the volume in smaller steps.

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https://bugs.launchpad.net/bugs/1091142

Title:
  Volume scrolling inconsistent

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