Re: Noise Gate
Been using this for a whole lot of years and it has always been working fine:
Fame Noise Gate Kompakt Effektpedal mit Threshold-Regler sowie zwei Funktionsmodi Hard und Soft und True Bypass Footswitch.
www.musicstore.de
Absolutely no fuss, super simple but working. Very obviously, it's a gate that also comes from other companies (possibly Joyo, Donner, Harley Benton and whomever), they're all the same, just rebranded.
You can surely get much better gates (with trigger inputs, release controls and what not), but in case you don't have much noise issues, I always found this simple thing to just do the job.
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Re: Latency
I'm sort of quite a bit into that topic since decades already, and there's too many implications (some pretty astounding ones included) to cover them all right here. There's also no simple, universal truth about how which kinds of latency perceptions affect which persons, it's a pretty wild mixture of things.
But there's still a very simple and universal (yes!) truth about latency in general (not about the perception): Try to avoid it as much as you can. If you have the choice between a tool introducing latency and another tool not doing so, as long as they're playing on a similar level (or even if they don't but just "get the job done"), choose the one not introducing latency. As easy as that.