Softube’s new Bus Processor plugin brings you the “essence of the legendary 670” for just $99Softube has unveiled the Bus Processor 670, a new plugin designed to capture the “magic” of the legendary dual-channel variable-mu tube compressor.
Positioned as a modern take on the highly sought after Fairchild 670, the plugin aims to deliver the “unmistakable weight, warmth, and authority” of the original hardware while expanding its functionality for contemporary production workflows.

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Originally used as a mastering limiter for vinyl, the 670 is one of the most iconic tube compressors in recording history, with its distinctive harmonic character heard on records from Motown to Abbey Road.
Softube says the Bus Processor 670 combines the “finest elements” of the original design with “it-would-be-cool-if” ideas to create a unique tone machine capable of the musical and harmonically rich compression of the original.
To start, the plugin adds full control of saturation points with dedicated knobs for tube and transformer saturation and a calibration knob to influence the compression-dependent saturation of the variable-mu architecture.
Also included are sidechain options that give the user control over filters, tone shift and mono/stereo linking, as well as separate outputs for M/S channels. Meanwhile, new spatialisation features include an air band, mono maker, and a stereo widening knob.
Softube has also built the plugin with modern engineering and production workflows in mind, with support for its Console 1 mixing system and Flow Studio hardware ecosystem.
The Bus Processor 670 is available now at an introductory price of $99 (regular price $149), and is also included in Flow Mixing, Mastering, & Complete Suite subscriptions.
“Full-featured but dead-simple to use, Bus Processor 670 lets users find the magical sound of the 670 for themselves, in a workflow that works for the modern music maker,” says the company.
More information is available at Softube.
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