Softube Bus Processor 670 Brings A Modern Variable-Mu Compressor To The Master Bus

// Originally on Production Expert 27 May 2026

Softube has today announced Bus Processor 670, a plug-in modelled on the variable-mu tube compression architecture of the original Fairchild 670 hardware. It sits alongside the company's existing Bus Processor, which is based on the SSL G-series bus compressor, and is aimed at engineers looking for a character compressor for mix bus and mastering duties. We have the details.

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