-e: the volume meter on the attenuation inspector element isn't shown initially and also vanishes on changing the wet mixing option on other effects

-repro:
--create project
--create audio mixer
--open audio mixer
--click master group
--NOTICE the volume meters are shown for the attenuation
--add lowpass effect to the master group
--allow and disallow wet mixing for the lowpass twice
--NOTICE the volume meters for the attenuation are now gone
--click on the attenuation effect in the inspector to make them show up again