Hi mate,
Glad another one brave soul have tried, as I said if you're tired of using FET for noisegate, downward expander is one option.
quote and my thought from your link.
A gate (sometimes called "noise gate") is a downward expander with an extremely high ratio (and abrupt). When your signal level reaches the threshold, a gate goes from "closed" (no signal passes through) to "open" (all of your signal passes through).
The threshold where you want to set your signal to be limit (including your noise floor), and above this limit it will open up and signal will passes through. Threshold also is a common way of controlling noise and hum from high-gain distortions, single-coil pickups, and other noisy circumstances; when you pluck your note, the gate opens, and when the note dies down the gate closes, keeping quiet until the next note.
Tell us more later upon thorough testing your built buddy
BTW, this is more effective in the front of the chain before any noisy pedals.
Guitar -> gate -> dirt pedals -> modulation pedals -> amp.
If only someone could add send/return feature on the existing schematic it would be a great so to isolate just the dirt pedals and not affecting the back modulation part somehow.
Guitar -> gate in - gate send -> dirt pedals -> gate return - gate out -> modulation(chorus/delay/reverb etc) - > amp
Anyway mine without this feature is already useful in my analog setup and simple to built and for me I would recommend this compare to FET gate which I also built before. YMMV
