1 of the channels does not work right and has distortion. Channels 1,2,4 are working perfect and sound great!Missing the cover of the optional card slot. The item "Focusrite ISA 428 Preamp (READ)" is in sale since Sunday, August 25, 2019. This item is in the category "Musical Instruments & Gear\Pro Audio Equipment\Preamps & Channel Strips". The seller is "40hz-20khz" and is located in Miami, Florida. This item can be shipped worldwide.