ToneBoosters FIX4 v3

ToneBoosters FIX4 is a free dynamic equalizer that can be downloaded as part of the developer’s collection of discontinued v3 plugins. Although it’s no longer officially supported, I tested it on modern Windows and macOS systems, and it worked perfectly. Most recently, I used it in Studio One 5 on my Macbook Air with an M1 chip, and there were no performance issues. FIX4 offers 6 EQ bands, each with multiple filter types and dynamic processing.

The optional compression per band lets you use both regular and dynamic EQ within a single instance. Each band comes with adjustable attack, release, and makeup gain settings, as well as a soft mode for smoother compression. The plugin also includes an optional sidechain input and a dry/wet mix knob for parallel dynamic EQ processing. I also like the built-in spectrum analyzer. It’s well-designed and useful for visualizing the frequency spectrum while working in dynamic EQ mode.

FIX4 is available in VST and AU formats for Windows and macOS, making it a versatile and reliable option for modern DAWs. for recommending FIX4.