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Noise Gate vs. Hard Gate

There are two noise suppressors on the Pod HD, the standard "Noise Gate" and the more advanced "Hard Gate". In general I prefer the Hard Gate, because its a true gate. The Noise Gate is part gate, part signal processor and can result in "tone suck". At higher settings, it tends to make the tone sound thinner.

The Noise Gate uses less DSP than the Hard Gate; however, so sometimes it's the Noise Gate or nothing, and I use it with lower settings then.

Gate Overview

Here's what a noise gate is designed to do - either let signal pass through or block it completely. It's helpful to think of it like a physical gate. When "open", the signal should pass through untouched as though the noise gate isn't even in your signal chain. When "closed", no signal should be allowed to pass through. The gate detects the signal's volume level, compares it to a threshold setting, and determines whether the gate should be open or closed.

Most gates also feature a Decay parameter. This specifies how quickly the gate should close - whether the signal should fade out over time or be abruptly silenced. a 0 setting means the signal should jump from the threshold level to no output. Higher settings fade out over the specified time period.

Some gates feature a Hold parameter. This keeps the gate fully open even after the signal level diminishes to less than the Close Threshold. After the hold time is elapsed, if the the signal level did not return above the Open Threshold, the gate starts to close at the speed specified in the Decay parameter.


 

Open/Close Thresholds

The Hard Gate has two threshold levels - open and close. If the gate is currently open, it is only looking at the Close Threshold value to determine if it should close. If the gate is closed, it is only looking at Open Threshold to determine if it should open. This helps in two ways.

Single threshold gates are subject to jitter - consider a sustained note that is gradually decreasing in volume. The level you hear might be 96, 95, 95, 95, 95, 95, 94 db at 1/20th of a second intervals. The level the gate detects might be a little different, let's say 96, 95, 94, 95, 94, 95, 94. If the Threshold was set to 94.5 db, the gate would open and close rapidly as a decaying note hit the threshold value. It would sound like sputtering, which is very noticeable and undesirable.

With separate Open and Close Thresholds, you can set them a few db's apart, and the imprecision in the effect's signal level detection will not cause a sputtering gate.

This also comes in handy due to guitar naturally having a strong attack. Setting the Open Threshold high means when the gate is closed, you won't accidentally open it with soft noises you make when you're not trying to play a note, such as your fingers rubbing on unfretted strings. Yet, once you do purposefully play a note, the attack is strong enough to open the gate. Setting a single threshold gate to such a high threshold would mean that sustained decaying notes would get "cut off" rather than naturally fading to silence. With a low Close Threshold setting, however, you can let the note decay to almost silence before the gate closes.



While you can fake the above technique with a single threshold gate by turning up the Decay parameter, it's more favorable to set Decay lower and use two tresholds. It sounds better, and you'll get the expected gate behavior when you're playing quick staccato notes or sustaining notes.

Hold

The Hard Gate also features a Hold parameter that specifies a time to hold the gate open even after the Close Threshold has been passed. This can be used to reduce jitter as described in the last section, but as mentioned, staggered Open/Close Threshold settings should take care of that.

Where I find Hold is useful if you are using a longer Decay time. If you are playing a staccato part, the fade-out of the noise between notes is very noticeable, compared to if the noise were to remain at a constant level. Setting a hold time is basically taking a little time to make sure the gate should really be closing.


 

Decay

For a spacious lead tone, where any decay is going to be buried by reverb or delay, I like to turn Decay a bit off 0 such as 100-200ms - so there's not an obvious sound when the gate kicks on. For super tight rhythms, I like it at 0; but this means I have to be careful about my muting and exactly where I set the Threshold(s).


Date: 2016-01-03; view: 1176


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