Glensound GS-FW022 Versatile Two Channel 4 Wire Desktop UnitFeatures 2 x 4 wire circuits 1 x program audio input Audio inputs are transformer balanced Inputs & outputs on rear panel XLRs 4 wire inputs and program input have level controls Signal present LEDs indicate incoming audio present on 4 wire inputs and program input Front panel loudspeaker Headphone output (cuts LS) Variable LS dim Loudspeaker headphones volume control Program input can be switched to any of the 4 wire outputs and interrupted when