Density MKII is a highly-regarded, freeware stereo bus compressor audio plugin created by Herbert Goldberg (better known as “Bootsie”) under the Variety Of Sound brand. Released originally as a Windows VST plugin, it gained a legendary reputation in the home studio and producer communities for its ability to “glue” a mix together smoothly without noticeable pumping artifacts. Key Design and Purpose
The “Glue” Factor: It was specifically designed for stereo audio group mixing and master bus summing to blend disparate tracks into a cohesive sonic image.
Subtle Coloration: Rather than being a strictly transparent digital tool, the MKII version featured a redesigned audio engine capable of generating a pleasant, subtle second-order harmonic distortion during compression to give tracks an analog-like warmth.
Not an Emulation: It was not modeled after any specific hardware outboard gear. Instead, it blended classic dynamic shaping concepts with modern digital audio processing techniques. Standout Controls and Features
The “Range” Knob: A unique feature that sets the maximum limit of gain reduction. If set to 50%, for example, the compressor reacts normally to incoming transients but stops compressing entirely once it reaches that threshold, preventing over-compression and keeping the mix lively.
Mid/Side (M/S) Processing: It native-supported advanced stereo unlinking and mid/side processing, which allowed producers to compress the center elements (like kick and vocals) differently than the wide elements (like hard-panned guitars or cymbals).
Fast Setup: Users and reviewers frequently praised it for its intuitive layout, noting it took seconds to dial in a fantastic sound. Legacy and Evolution a Density mkIII review – Variety Of Sound
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