On the /r/ProgrammerHumor/ there were some novelty volume sliders created/prototyped.

The best I found so far:

by /u/BMJ


1 by /u/PM_ME_YOUR_WATERMELO


by /u/NeverMakesMistkes


by /u/TheSteganographer


by /u/RiderAnton


by /u/jetstream96r


2 by /u/theillini19


1 by /u/mrzacharyjensen


1 by /u/nimbim


1 by /u/NibblyPig


1 by /u/systoll


1 by /u/Jaeyuuji


by /u/renixreborn


by /u/HizkiFW


1 by /u/AuthorFilms


by /u/luiz_eldorado


by /u/flurrux


1 by /u/imnotafelontrustme


1 by /u/MrBlub


by /u/TromezHuezar


by /u/kamaln7


by /u/Wartpincer