Hello and welcome to this week's article!
Today we're going to talk about a type of guitar effect which is often overlooked, but that in some genre can make the difference: the Sustainer!
Let's start with the basics: the sustain is one of the four parts of a sound (click here for a dedicated article), meaning for example with the guitar, how long it passes between when you pluck a string and when the volume goes back to zero.
If we're playing the clean channel of an amp, the cleaner it is the shorter in theory the sustain is, while at the opposite, adding gain adds also compression, which keeps audible also the quieter parts for longer, with the result that the tone has more sustain.
Sustain can be added either by adding gain, distortion, tube saturation or directly by using a compressor, and the original, beloved sustain was actually a product of the signal overdriving the guitar amp tubes, which were not (voluntarily) distorting the tone, but producing a saturated clean channel which provided sustain, and made playing solos more easy.
By adding stages of gain and distortions, reverbs and delays, the guitarits have found many ways to add sustain, but all those methods change dramatically the tone, and sometimes this is not what the guitarist needs:
Sometimes what a guitarist need is a tone that is clean or just slightly distorted, but with an incredibly long sustain, so that all the nuances of the solo are audible and the beauty of the guitar tone can arrive to the listener without being completely disfigured by the other effects, as you can hear for example in the solos by David Gilmour of Pink Floyd.
This is where compressors comes into play: a compressor, if set in a way in which it boost the lower part of the signal without affecting too much the rest of the tone, can offer an alternative to the high volume tube compression of a saturated amp, and this has been the success of stompboxes such as the Boss Compressor/Sustainer.
Today in studio there is not even anymore the need of using a hardware sustainer, it is sufficient to have a VST one, and usually the guitar amp suites have some sort of compressor/sustainer bundled, but if you don't happen to have one, you can try one of these 2:
7amp Peak Sustainer - a free sustainer plugin
Hornet HCS1 (demo) - a paid compressor/sustainer
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