I bought Soundtheory Gullfoss. This is a hot auto EQ plug-in in the Twitter etc. I tried to find out what is great about this plugin by myself. Here is my review.

How Gullfoss

An auto-equalizer using artificial intelligence released by Soundtheory. The official declares it as “Intelligent Automatic EQ”.

Gullfoss used to support only the Mac until now, but in March 2019 a compatible version of Windows was released. This gives me the opportunity to experience this wonderful auto equalization.

As an aside, “Gullfoss” is the name of a waterfall in Ireland. The picture below is that, I thought it was so grand and beautiful.

What can be done

Gullfoss differs from regular EQ in that it does not cut or boost the frequency. Artificial intelligence is responsible for such work.

All we have to do is to set the “how you want to do” parameter to plus or minus.

The great thing about this is that it can clean up the areas where the tracks interfere and the sound gets muddy, especially in the middle and low range.

As far as I gather information on Twitter, it seems that even professional engineers recognize Gullfoss’s excellence in this part.

How to use

What we operate in Gullfoss are the five parameters at the top of the UI.

RECOVER, TAME, BIAS, BRIGHTEN, BOOST correspond to that. All we need is a simple operation to raise and lower these.

Among the parameters we should pay particular attention to are RECOVER / TAME.

RECOVER boosts the buried component, and TAME cuts the component causing the interference.

This allows us to create a beautiful mix of the low and mid range.

The BIAS parameter applies to +, RECOVER and-to TAME, and can adjust which process is used.

The impression

The quality of the equalization process by Gullfoss was not possible with my mixing skill. It is particularly good at low and mid range processing.

And it is also a point to be praised that it is very easy to operate. Even an amateur like me can get this wonderful experience soon.

The point to note is that if you move the parameters too much the sound will be degraded, so be careful not to overdo the processing. Then CPU processing is heavy. The tracks to which Gullfoss should be applied are bus tracks and master tracks.

Also, if you want a punchy mix like NYHC, we should have the choice not to use Gullfoss. Although the high range can be adjusted with the BRIGHTEN parameter, it may be possible to respond with another plug-in.


This is my review. What do you think?

I think that high-performance plug-ins have been released well in recent years.

And I think plug-ins like Gullfoss, especially those with advanced automatic processing, will become the DTM standard in the near future.

The beautiful mix of Gullfoss’ advanced processing is worth to experience. I recommend purchasing this great plugin.

The official website of Soundtheory Gullfoss is here.