Step option and snap bug

[wyrex]

On my system <10% volume is completely mute, 10-12% is steep change and anything more than that slowly becomes less substantial change. Option like --step would be useful to specify amount of change (XF86AudioRaiseVolume keybind in xfce settings are overridden by this panel).

After you start dragging volume if you hold still for 1 second or more it becomes wider (shown in right pic but I moved mouse accidentally a bit in this screenshot) and cursor moves to top of the circle while volume "snaps" down 1-5% or so and dragging doesn't work properly after that. If you move immediately dragging works normally. It would be useful to show percentage next to slider as it's tedious to get some exact sound level without trying tons of times.