The TubeTech CL-1B is a classic, opto-compressor designed by Danish engineer, John Petersen, in the early 1990s. This unit has gained a reputation for its exceptional sound quality, reliability, and versatility. The CL-1B features a unique, program-dependent release characteristic that allows it to adapt seamlessly to various audio signals, making it suitable for a wide range of applications, from gentle mastering to heavy compression.