Despite this toggle becoming available when selecting the Bar effect, and the option's tooltip saying it should work, it doesn't
Checking the code of
"Packages/com.vrchat.base/Runtime/VRCSDK/Sample Assets/Shaders/Mobile/ToonStandard/Dependencies/AudioLink.cginc"
reveals that indeed, the bar effect does
not
care about the "use mask" toggle, while the scroll effect
does
Is quality control really that hard?