TheMasker by LIM is a freeware mixing tool inspired by the popular Trackspacer plugin by Wavesfactory.
The LIM, or Laboratory of Music Informatics, from Milan University, located in Italy, has released a collection of free plugins developed by students of the course ‘Development of Technologies for Music Production.’
Given that these plugins are the result of the student’s efforts, no responsibility is taken for the software’s stability.
However, each free plugin on the website is safe from malware and should work well in any mixdown scenario. That is, of course, if you’re willing to run software created by young and inexperienced (but obviously highly skilled) DSP developers.
It should be noted that the plugins have been tested to work correctly at different sampling rates and also to load properly on mono and stereo channels.
Now, let’s focus on the latest LIM plugin4, called TheMasker.
TheMasker is an automatic frequency masking compensation plugin inspired by popular commercial releases such as Trackspacer.
Simply put, it analyzes the sidechain signal and applies dynamic EQ corrections to the audio target to attenuate overlapping frequencies.
Let’s say you have the lead vocal competing for space in a full mix with loud electric guitars.
In a past mixdown scenario, you would manually ride the channels’ faders and try to carve space with careful EQ adjustments for each instrument. Thankfully, in modern times, we have smart tools at our disposal that make our lives easier by letting us mix music faster.
TheMasker does what it promises very well, and it does so with a very simple workflow. All you have to do is load it on the mixer’s track you want to reveal in the mix.
Then, according to your DAW settings, route the sidechain signal to the plugin’s sidechain input.
You’ll find a clear visualization of what the plugin is doing in a resizable window.
You can visualize either the input signal or both the input signal and the sidechain signals in white and yellow, respectively.
The most interesting part is the purple Delta visualization, which shows the affected frequency range and the amount of change in dB.
The Sidechain Level lets you boost or attenuate the sidechain volume entering the effect to fine-tune it.
You can then select to Bury or Reveal either the Masked or the Clear Frequencies.
Typically, you want to bury the masked frequencies and reveal the clear ones.
The Clean Up slider controls the range of the frequency spectrum being affected.
Finally, you can blend the desired effect alongside the AMT (Amount) knob in the top-right.
Download: TheMasker/LIM Audio Plugin Collection (FREE)
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Last Updated on March 4, 2026 by Tomislav Zlatic.
