With the Morley ABC Pro switcher/combiner, you can route one instrument signal to three output sources, which lets you select between either output independently or combined. It features isolated channels, so there's no crosstalk or bleed-through. The ABC Pro uses Ebtech custom isolation transformers to prevent ground loops. And the silent switching means there's no “pops” when switching. Polarity reverse and ground lift switches provide quiet operation. Lastly, it features LED indication, cold rolled steel housing, powers from 9V battery or adapter.