Time to sum some signals. The Radial Workhorse SubMix is a 4 x 1 line mixer module that is compatible with 500 series racks allowing you to sum four audio signals into a single channel. The Workhorse SubMix offers four 1/4 unbalanced input connectors and individual level controls for each input source. Radials innovative dual-gang AccuState circuit simultaneously adjusts the input gain and sensitivity to achieve the best possible signal-to-noise level. The Workhorse SubMix is perfect for summing multiple samplers drum machines keyboards and any audio playback sources in the studio without introducing noise.