This is what I would do:

Add a Send from the bass track to a new bus with an EQ plugin, then volume automate the new EQ bus so that it's only engaged at that one note. You'll still have to find the frequency you're trying to attenuate. I would use a one bar loop over the problem section and fiddle with the EQ until it sounded right.

I do a similar trick when I want to only add a delay to a particular syllable in a vocal track.


DC Ron
BiaB Audiophile
Presonus Studio One
ASUS I9-12900K DAW, 32 GB RAM
Presonus Faderport 16
Too many guitars (is that a thing?)