microphone-sensitivity-xxx icons should look in all sizes (or at least in small sizes - 22, 24) like the 16px version - that is, the "sound lines" are next to the microphone, not above. Also current microphone-sensitivity 16px icons doesn't use stylesheet, so this should be fixed too.
Just going to point out that the low/medium/high icons do in fact have the stylesheet, and have fill:currentColor. The bug is that the have style="color:#4d4d4d;..." which overrides the fill:currentColor. We'll need to remove that definition from the style tag.
Git commit 3574280c9381af45b18430e797957ff4e628db93 by andreas kainz. Committed on 27/04/2017 at 20:41. Pushed by andreask into branch 'master'. BUG 377012 update microphone-sensitivity icons M +4 -5 icons-dark/status/22/mic-off.svg M +8 -15 icons-dark/status/22/mic-on.svg M +8 -16 icons-dark/status/22/mic-ready.svg M +8 -10 icons-dark/status/22/microphone-sensitivity-high.svg M +8 -10 icons-dark/status/22/microphone-sensitivity-low.svg M +8 -15 icons-dark/status/22/microphone-sensitivity-medium.svg M +7 -60 icons/status/16/mic-on.svg M +9 -63 icons/status/16/microphone-sensitivity-high.svg M +9 -63 icons/status/16/microphone-sensitivity-low.svg M +11 -68 icons/status/16/microphone-sensitivity-medium.svg M +4 -5 icons/status/22/mic-off.svg M +8 -15 icons/status/22/mic-on.svg M +8 -16 icons/status/22/mic-ready.svg M +8 -10 icons/status/22/microphone-sensitivity-high.svg M +8 -10 icons/status/22/microphone-sensitivity-low.svg M +8 -15 icons/status/22/microphone-sensitivity-medium.svg https://commits.kde.org/breeze-icons/3574280c9381af45b18430e797957ff4e628db93