All Analog Signal Path - no digitals in here! Extremely Transparent - Add dynamic control without altering the original tone of your instrument 3 Compression Ratios - 2:1, 4:1 and 10:1 ratios offer lots of flexibility Attack and Release Control - allows for ultimate control over the compression characteristics Mix - Blend uncompressed signal in with the compressed signal for parallel compression, New York Style! Metering - Meter both gain reduction and input on separate meters. Tone + Color - Adds mild harmonic distortion with a mid range cut or an upper mid range boost. Sidechain Send/Return- 3.5mm TRS jack send and return for sidechain compression. Sidechain High Pass Filter - a variable high pass filter that filters low frequencies from the sidechain. The filter frequency ranges from 20Hz to 400Hz. Improved Low End Frequency Response - To handle those low low sounds, completely flat down to 20Hz. True Display LEDs - Bright multi-color LEDs always let you know what the compressor is doing. True Bypass - The Empress Compressor employs true bypass, so you can be sure that it's not affecting the signal when disengaged. Small Size - New enclosure approximately half the size of the original compressor, which is delightfully small when considering all the features packed into this unit. Beautiful Case - It has a sparkle you can't deny