Matched stereo pairs and detented input and output level controls optionally available.
Universal Vari-Mu Compressor
The Chandler RS660 is modeled on the historic Fairchild 660 and EMI RS124 tube compressors and is hand-built at Chandler to the highest quality standards. The compressor works on the same functional and operating principle as its two predecessors, but covers a wider range of applications thanks to its modernized circuitry and extended time constants.
In positions 1 through 3, the seven control stages of the Time Constant knob encompass the Fairchild 660's fast attack and release settings for a colorful vintage compressor sound that can also be used to absorb rapid level changes. Numbers 5 through 7 represent slower, more cautious time values for compression with fewer artifacts and no distinct coloring. Position 4 is a compromise of both sound worlds, which is particularly suitable for vocals and acoustic guitar.
TubeTech CL 1B All Tube Mono Compressor 
Empirical Labs "matched pair" of 2x EL 8X
SSL Solid State Logic The Bus+ 2-Channel Bus Compressor/Dynamic EQ