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You can't use the Zuul both places without two pedals... it gates once, period. If it's in front of the amp it gates before the amp, if it is in the loop it gates at the loop, not both. The key input is used so you pass in a pre-distortion signal for it to track to gate better.
I've seen some intentionally misleading posts about this in other places...
They're both great gates, and I've got a Zuul here currently. I have seen a couple guys have issues with noise from the Zuul when used with some OD pedals and haven't seen a description of what causes it.
You can't use the Zuul both places without two pedals... it gates once, period. If it's in front of the amp it gates before the amp, if it is in the loop it gates at the loop, not both. The key input is used so you pass in a pre-distortion signal for it to track to gate better.
I've seen some intentionally misleading posts about this in other places...
I have a G-String and it works great for me, it's couple of years, now.
Zuul may be great gate, but need to have separate splitter/stereo pedal to use key input would be a deal breaker for me, if I was in a search for noise gate.
You're right of course. I do feel however that the key input almost allows it to serve as a front-end gate too in terms of end result. Given that its using the same signal a front end gate would, it can be set more aggressively, being applied to a compressed signal but with uncompressed settings so to speak. Essentially gating off the same ratio of noise that a front end gate would, but after its been amplified.
That made a lot more sense in my head than with words