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Re: Is upgrading my solution, or is there another option?

The ZLX has gotten good reviews, typically saying "it sounds more expensive."

For gates you would use the channel inserts.

I'm skeptical, though, that the drums are the source of feedback....  Sympathetic vibrations, yes, and that should be fixable with a drum key.  That said, gates aren't a bad thing to have, although you might find other things to spend the money on...