This plug-in features 64-bit floating point processing, 3 EQ bands, high and low pass filters and a "preamp stage". It reminds me a lot of what a Pultec-type plug in can do, limiting you to two shelving filters with coarse selectable frequencies and a mid-band filter with a fine selectable frequencies (150 Hz to 4 kHz) and a high Q (bandwidth) toggle.
SonEQ, according to its manual models "A550 y PulEQP". I believe this was a translation error and it means that, from what I gathered researching this plug-in, the low shelf models a Pultec EQP-1A and the high shelf models an API 550 equalizer. The low shelf has both boost and attenuation, just like a Pultec.
The preamp/drive control simulates analog tube distortion. You control the amount of saturation with the input/output controls. The preamp circuit is post-EQ and it can be disabled with the on/off toggle switch.
There is also a "WOOW" control. It enables an all-pass filter which you can read more about here: http://www.uaudio.com/blog/allpass-filters/ There is also a "Drive" knob available.
Unfortunately the fine frequencies cannot be typed in however a control-click drag results in precision control for exact numbers.
This plug-in works particular well on bass guitar, snare and kick drums. It is a great addition to any plug-in collection because it gets results. It has a good analog quality to it in that you can push it hard and it still sounds really good! I'm surprised it's free! The manual is also rather well-written (although the English translation is a little off here and there) and I definitely recommend reading it, especially for it's preamp level suggestions. So grab it while you still can.
Thanks fese - great little review. SonEQ is one of my favorites too! It really is "something special" on vocal tracks. I often use SonEQ on my own vocal tracks and then apply any little surgical operations with IIEQ Pro. Well, that might be a changing "dynamic". .. "dynamic" because I'm so impressed with Melda's MDYnamic & MAUtoDynamic EQs.
Yesterday I re-discovered this great eq. I tried it on a snare and just couldn't believe what a huge difference it made.
I would like to use this topic to ask a question. Can anyone check, if their SonEQFree VST3 version allows numerical input after right-clicking on the knob e.g. BOOST or GAIN ? VST2 has that functionality, but for some reason VST3 doesn't allow it. When I right-click nothing happens. I'm using the latest 1.2.1 release x64. I'm on Windows 8.1 x64.
I emailed developer about it earlier today. So far no response. I just asked a question if that's the proper behaviour. You had better idea about reporting it as a bug. Perhaps something can be done about it. I figured that since last update was in November 2016 and plugin is free, there is very small chance he is willing to check it out.
By the way I have no idea why there is March 2018 mentioned as release date for latest version 1.2 on this website. My plugin has a date 20161123, both VST2 and VST3.
"By the way I have no idea why there is March 2018 mentioned as release date for latest version 1.2 on this website. My plugin has a date 20161123, both VST2 and VST3."
Same for my copy.
They replied to my ticket, kindly. To get some additional info. So I sent these additional info two hours ago. I'll probably get a new reply tomorrow. We'll see. But I'm pretty confident for a next update with that bug fixed.
I also received an answer from Sonimus yesterday. There is something in the works regarding VST3 support for the 2020 update. Luckily it's not a huge inconvenience and SonEQ can still be used without any glitches.