Introducing ATEM Constellation HD, the world's most powerful HD live production switchers! These incredibly powerful HD switchers are available in 3 great models, including a 1 M/E model with 10 inputs, a 2 M/E model with 20 inputs and a massive 4 M/E model with 40 inputs! Plus each SDI input features a full standards converter! ATEM Constellation includes advanced features such as DVEs, ATEM advanced chroma keyers, media players, multiviews, and SuperSource processors! Plus the built in Fairlight audio mixer includes a compressor, limiter, 6 band parametric EQ and expander on each input. The free ATEM Software Control is included, or you can add a 1 M/E, 2 M/E or 4 M/E ATEM Advanced Panel!