Whirlwind AB-8 - 8-Channel Microphone/Line Level SwitcherThe AB 8 is an 8 channel, balanced, bi directional signal switcher, 1 in 2 out or 2 in 1 out per channel. Features: Eight channels of balanced A B switching for line, mic or MIDI signals. Each of the eight channels can be individually switched or assigned to a Master Control circuit. Master switching is controlled through front panel pushbuttons, optional footswitch or automatically triggered by loss of signal on channel one of A input. Can be