Doepfer A-150-8 Octal VC Switch is a logic module for modular synthesizers in Eurorack format. The eight-way voltage-controlled switch allows up to eight audio or control signals to be switched individually or in groups via electronic switches. Each of the eight switches is equipped with a manually operated button, a CV input, a common off/input and two inputs/outputs. There are two modes of operation for each switch: Toggle or Level. In toggle mode, the rising edge of the CV signal or pressing the button changes the current switch state. In level mode, the switch state is defined by the voltage applied to the CV input or by the state of the operator pushbutton. Master/slave groups can also be defined. In a group, the upper control unit of the group operates as a master and also defines the switching states of the underlying slaves.