Whirlwind podDI Direct BoxThe Whirlwind podDI Direct Box is a single output summing direct box. Use the podDI to connect CD and MP3 players, computer sound card outputs, DJ mixers, etc. to professional equipment with balanced inputs such as a mixing console. Accepts stereo inputs and sums them into a single mono output. A variable attenuator on each input allows level matching between left and right inputs. This makes the podDI a passive mixer in split track audio