Preamp, EQ, and opto compressor all work fine and this gear really sounds great. Loved it on drum overheads, female vocals, and acoustic guitar among other things.The item "Manley Langevin Dual Vocal Combo Channel Strip (Mic Preamp + EQ + Compressor)" is in sale since Wednesday, December 12, 2018. This item is in the category "Musical Instruments & Gear\Pro Audio Equipment\Preamps & Channel Strips". The seller is "drone00769" and is located in Ellicott City, Maryland. This item can be shipped to United States.