What i find interesting if it works without sucking the tone too much (it is mandatory it does but maybe very little) is that its more efficient than any noise gate since it also removes the junk during playing. Im actually curious of why it works just for the sake of understanding. Just so you know since its the topic : the reaper fft has a cancellation function similar to waves z or x-noise even if its not perfect. When i play for practice i use it to remove the junk even if i suck tone cause its less fatigueing for the ears. You can finetune it too. Maybe its function is sort of similar to what you are doing.