Following up on this thread in case anyone has additional comments.
I have a Brown Dog that I really like. It gates pretty well, though does let a little fizzle through sometimes on note decay. Probably a technique issue more than pedal issue for that specific "problem". But sounds balls out awesome with my BassIQ and is overall really tight and clean. Way over priced, but that's a different thread.
Anyway, I'm have other gating needs beyond built into a bass fuzz. So I'm researching separate gates. Either floor/pedal or 1U racks. I'm hoping to find something that can provide a really hard, fast chop/gate to the end of my notes to give me some industrial sounding sampled effect to my playing. I have a Rane DC24 rack unit that has a gate, but it's slow and lacks any type of good response time control. I've read the Alesis 3630 can be used for fast and hard gating, though the compressor portion usually gets panned. Unsure on the standard MXR and ISP gate pedals, they only have a threshold knob so it'd probably depend on how fast they truly are.
I also considered some type of momentary off switch/button added to my instrument or as a stomp. I think the BOSS NS-2 set to Mute can do that, though I haven't personally experimented with one yet.
Basically I want the exact opposite of what your typical gate user likely wants which is something invisible to simply kill noise and hiss during quiet interludes. Instead I want a gate to provide instant and hard, but automatic, mute. I'd experiment with throwing it after all my dirt boxes but before filters, and right in the amp effects loop to see how it does killing the entire chain.
Anything come to mind?