Issue 94

Blue Cat Audio: Triple EQ

A free 3 band semi-parametric equaliser plugin.


13 December 2023

With a background in industrial software engineering, Blue Cat Audio’s founder Guillaume Jeulin understands the importance of stable software. The French company offers professional audio effects, innovative audio analysis tools, and standalone applications that transform Digital Audio Workstations into professional audio processing environments. As an extra arrow in Blue Cat’s quiver, it also offers consulting and engineering services for custom software development, and as such has amassed a variety of customers, ranging from recording studios, universities and recording schools, and home studio owners, to recording engineers, and professional and amateur musicians.

The Triple EQ plugin includes a low-shelf filter, a high-shelf filter, and a boost/cut peak filter. Its wide range of gain (+/-40 dB per band) and bandwidth (.01 to 5 Octave) makes it very versatile to create any filter shape. The three filters are linked together so that when you change the centre frequency or bandwidth the parameters of the three filters are modified accordingly, meaning that you can control the entire equaliser characteristics with a single mouse click.

The graph shows the computed frequency response of the plugin, so that you can exactly know how your signal is processed. The controls are directly available on top of the filter graph, making the design of the filter shape even easier. Triple EQ also offers a dual channel version, with independent left/right, or mid/side equalisation capabilities. Both channels can be linked together in many ways, letting you transform this plugin into a frequency-dependent panner and much more.

The plugin can be controlled in real time with MIDI or automation, and it is capable of absolutely zipper-free clean and continuous time-varying equalisation with no latency. it is the ideal companion of our audio analysis tools for signal-dependent side chain filtering.

This plugin is also available in the Blue Cat bundle, ‘Freeware Plugins Pack ii’.


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Issue 94