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I can see two ways you could use it, depending on whether the delay is in the amp's fx loop or not.
A) Gtr > NS-2(in) > NS-2(send) > Drives/Vibe/Flanger > NS-2(return) > NS-2(out) > Delay > Amp(in)
This is your basic 'in front of the amp' method and will not reduce the levels of noise from your amp's preamp/drive channel.
Alternatively, you could include the amp's preamp in the NS-2's loop if you have the Delay in the amp's fx loop.
Gtr > NS-2(in) > NS-2(send) > Drives/Vibe/Flanger > Amp(in) > Amp(fx send) > NS-2(return) > NS-2(out) > Delay > Amp(fx return)
This will cut the noise from both your drive/modulation pedals and your amps preamp gain.
The only problems may be if your amp's effects send levels are too high, both for the delay (as @John_P said) and also for the NS-2 itself. On my board I have a clean boost in the NS-2's loop - if I crank this up full and hit the guitar hard (this does give a level about 10x louder than my highest gain sounds, though) there is some clipping in the NS-2 (probably overdriving the return buffer). That is a pretty high signal level, though - you may be ok with the amp's fx loop, especially if it's got a send level.
I've found the NS-2 to be excellent when used correctly with the noisy pedals in the NS-2 loop. It tracks the guitar dynamics really well and doesn't interfere noticeably with sustain. I have the 'decay' set at minimum and the 'threshhold' set at just below half way which opens the gate with the lightest touch of a string but closes when the guitar is gently muted. I noticed a very slight reduction in top end 'air' but this was outweighed by the vastly reduced noise fron my stacked overdrives and boosts. And no constant phaser 'swooshing' when not playing with the phaser switched on.
Hope this helps.
I found the ns2 did jack with my amp noise unless I ran it like that.
Slightly annoying that I didn't find out about that before I bought a decimator >:D< I still think the decimator is a little better, but yeah.
It's less complicated than it looks (though I'd always need the sheet in front of me to help me set it up as it's not exactly terribly intuitive).
But yeah as I said, I found it didn't work well at all for amp noise unless I ran it like that. The other big advantage of running it like that is that you can kill noise both in front of the amp (guitar and pedal noise) and preamp noise as well (high gain hiss) at the same time.
The best way of thinking about it is ...
it reduces the noise of anything that's in the NS-2 loop
but it tracks whether a note is being played or not (and applies the noise gate/reduction) from the signal at the ns-2 input
If it was simply placed after the noise producing effects (like a conventional noise gate), it couldn't detect anything played quieter than the level of the noise (as it would be obscured by that noise).
I wouldn't like to set up method B above from scratch at every gig, though. It would save a load of time if you had a pedalboard set up with a pre-wired input/output box (Guitar in/ Send / Return / Board out) - basically a '4-cable' method with your effects board.