This A/B Box is amazing! Not only can you go from one source into two, but you can also go backwards. That's right, you can put two sources into one and switch between the two of them. Lets say you want to take your guitar and go into two MXR Rockman X100 pedals and then come back into one delay pedal. Well with this pedal and the Buffer/Splitter from Earthquaker Devices you can. Manufacturer's description below.

Designing a rig with quick-switching capabilities to meet the standards of your songs shouldn’t be a hassle. Quite the contrary — ask EarthQuaker Devices. The company’s A/B Box is designed for simple 2-way switching between virtually any two sources you’re working with. Switching amps or channels? Need speedy muting or wet/dry engagement? Whatever your cause, the EarthQuaker Devices A/B Box is standing by to assist. Its passive engineering eliminates circuitry between the input and output for completely fluid bidirectional usage. Plus, its space-conscious footprint is perfect for placing in tight quarters on your pedalboard. Heed the sage advice of guitarists here at Sweetwater: the EarthQuaker Devices A/B Box is a must-have compact tool for your setup!