The AB-8 is an 8-channel, balanced, bidirectional signal switcher (1 in - 2 out or 2 in -1 out). Mic level audio, line level audio, and MIDI signals can be routed with the AB-8. The AB-8 auto-senses loss of input on the primary inputs, and automatically switches to secondary inputs for backup in live tracking applications. It can also be used to manually switch between inputs and outputs when multi-tracking in a studio. Channels can be switched individually or globally and AB-8 units can be master/slaved for switching large numbers of channels.