The MB3X Multi-Band Mastering Compressor is a high-quality plugin modeled after the Rocksonics Professional Audio hardware from the mid-1990s, enhanced with exclusive features available only in the software version. Designed for mastering applications, this compressor offers smooth, low-distortion dynamic control through multiple layers of program-dependent RMS level detectors. It features three fixed compression bands separated by specialized Bessel crossovers that minimize phase distortion and eliminate pre-ringing, ensuring a clear and natural sound. The intuitive single Threshold control combined with individual band trim adjustments enables quick and precise setup.

Beyond the original hardware capabilities, the MB3X plugin introduces advanced controls such as a unique UL THD setting that reduces total harmonic distortion to nearly inaudible levels across most frequencies. Users benefit from A/B memory recall for comparing two sets of settings, wet/dry mix controls for parallel compression, and a variable saturation feature that adds subtle harmonic warmth. Additional enhancements include selectable gain reduction meter scales, automatic mono/stereo channel switching to save CPU resources, external sidechain input, and input trim control. The plugin also supports internal oversampling with zero latency mode, making it suitable for both mastering and live performance scenarios.

Ideal for balancing audio spectra in environments like web radio or for preserving tonal integrity during mastering, the MB3X brings clarity and dynamic control that highlights the finest details in audio material. It is a 64-bit compatible plugin available in VST2, VST3, and AAX formats for Windows 8 and later, as well as VST2, VST3, AAX, and AU formats for macOS 10.11 and newer, supporting both Intel and Apple Silicon processors. A free 14-day trial is offered, allowing users to explore its capabilities before committing.