Slider percentage and hover-status percentage differ

[RalphCorderoy]

Click to have the slider appear with the percentage at the bottom of the slider. Keep the pointer over volti so the status pop-up also appears. Use the cursor up/down keys to adjust slider by ~1% each press. The number at the bottom of the slider and the percentage in the slider differ quite a lot of the time, e.g. they both display 0, but then 1 v. 2, or slider 7 v. popup 6%. Presumably different rounding is being applied?

The width of the slider's window isn't wide enough to display 100, only 99. The 100 gets truncated at each side.

The beep when cursor up/down reaches the end of the slider is very annoying. I might want to quickly reach zero and then move slowly back up. I get a loud harsh beep on hitting zero, several of them actually because of keyboard repeat rate. Not good when wearing headphones.