@magomusica AHA! That was the missing step indeed. I went back to an event with the parameter and did just that, and I think I’ve got it working as you describe. I’m finding it to be choppy/erratic on noisier recordings so it won’t substitute for actual noise reduction, but it might help in some cases where there the voice signal is a lot higher than the noise.
Again, thank you for sharing this recipe.
(Related to steps here: Is there any way for a sidechain to effect a parameter? - #2 by Bradgentle )