How to add preview option to an existing switcher?
There are two basic ways: Add a multi-input DA, such as a 4 times 1:2 DA, to where all sources are connected. A typical DA would have two outputs for each input, one connected to the switcher, the other to a monitor. If the DA has a 4×1 built in switcher as well, then only one monitor is needed to preview all inputs. Use a switcher with looping inputs, connecting the loop output of each input to a monitor or an X-to-1 additional switcher.
