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Pitch Correction / Auto-tuning Plugin by GVST
GSnap by GVST is a Virtual Effect Audio Plugin for macOS, Windows and Linux. It functions as a VST Plugin.
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GSnap is an auto-tune effect. It can be used subtly to correct the pitch of a vocal, or, with more extreme settings, to create a robot-voice effect.

For GSnap to work effectively, the input signal should be monophonic, at a good level and reasonably noise-free. For example, a clean, mono vocal recording, without excessive noise or reverb. Effect plug-ins should be placed after GSnap in the signal chain.

GSnap starts off by detecting the pitch of the incoming audio. The Min Freq and Max Freq parameters help the pitch-detector by narrowing the range of frequencies it needs to consider. Also, the Gate parameter should be set so that the pitch-detector ignores background noise during "silent" passages.

The Speed parameter sets the number of wave repetitions required for positive pitch-detection. Lower values for Speed will allow faster pitch-detection, but will increase the chance of false detection. The default value should be fine in most cases.

Once a pitch has been determined, GSnap applies the specified pitch-correction. There are two modes of pitch correction: fixed scale and MIDI. Fixed scale correction has a fixed set of snap-notes, while MIDI correction is controlled in real time by MIDI data.

The Threshold parameter sets the largest pitch-shift that will be applied to the input. It defines a region around each snap-note that will be corrected to that note. The GUI shows the snap-notes and regions in effect at any time.

The pitch-detection and correction can be made to use a different reference frequency using the Calibrate parameter. This sets the frequency of A above middle C.

Additionally, GSnap will respond to pitch-bend and modulation MIDI messages to apply pitch-bend and vibrato. The Pitch Bend, Vibrato and Vib Speed parameters control these effects.

Latest User Reviews

Average user rating of 4.00 from 1 review

Reviewed By Basjoe [all]
October 2nd, 2007
Version reviewed: 1.0 on Windows

After recording a folk group I realised that there were some distinctly dodgy notes on the mandolin, so some of the pitches would need digitally retuning. I downloaded this plugin, and was immediately impressed by the no-nonsense, easy-to-understand gui.
I set the effect to constrain the mandolin part to one key (G major). I set the other controls to minimise the artifacts created by the pitch recognition process. (Obviously, there are always going to be some artifacts of this type.)
For a free VST effect, this really is an astonishing thing, and I am very grateful to the talented developer for making this available.
Even the mandolin player was impressed, and he's a confirmed technophobe !

In choosing marks, it might appear churlish to only give say 8/10 for sound, but to me this indicates that this effect is 8/10ths of the way towards software costing huge amounts of cash. Similarly, I suspect the author is probably worthy of higher than 8/10 for support, but in truth I never needed to call on this service.

I'm rather surprised that I'm the first to review this, but if anybody reading is wondering whether this effect is worth trying, then I say - go ahead, it's excellent !
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