Audified has released the U73b Compressor plug-in for Mac (AAX, AudioUnit, VST2, VST3) and PC (AAX, VST2, VST3), an authentic emulation of the 1960s Telefunken broadcast compressor/limiter. Optimised for mastering, the plug-in also lends itself to drums, bass, guitar, vocals, and voiceovers.

The original U73 was an all-tube, three-stage push/push variable-mu design to conform to the standards set by the IRT (Institut für Rundfunktechnik). In addition to the transformation from hardware to software, Audified has added input and output gains, both before and after the modelled compression circuit to aid adjusting compression in a more modern manner, as well as a vu meter and sidechaining.

The upper knob acts as a compressor/limiter switch, switching between Kompr (compressor), Durchschalt (bypass) and Begr (limiter) modes. The compressor mode has a lower threshold setting and a gently rising ratio; reversely, while limiter mode provides a higher threshold setting with higher ratio with soft-knee compression. The lower knob sets the release time – the first three positions provide fixed release times, while the three red-coloured positions provide adjustable programme content-dependent release time options. Sidechain selects the signal source for controlling gain reduction.

The U73b Compressor is available as an iLok dongle-protected plug-in at US$149.

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