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If anyone knows a way to remove a tambourine from a mix, that person will be my hero. I've tried every stem splitter I know, dynamic filters, fixed and dynamic eq, filtering plug–ins that "learn" the noise etc. Nada.
Some people should never be allowed near a tambourine.
DrDan to the rescue. He was able to isolate the tambourine well enough—I'd forgotten that it was my only percussion and the tool he used sent it to
Drums—then sent me the resulting stems.
Mixing the remaining stems made the mandolin sound weird. So I took
Drums, inverted the polarity, then brought it up to a level where it cancelled the tambourine in my mix. It wasn't 100% but I didn't need that as I had a better tambourine track that masked any artifacts.
Declaring victory. Thanks, Dan, I owe you one!