Teenage Engineering's ZM-4 Line Module is an easy-to-install expansion module for the OP-Z that provides additional line inputs and outputs, as well as connections for MIDI, trigger, and PO sync. Two of the ports are for audio applications. The Stereo line inputs and outputs do exactly what they are supposed to. The output can even be assigned as 2x mono single outputs and can also supply a headphone. In addition, the ZM-4 can be used as a loop-in path for external effect devices such as a distortion box. The other two connectors can be used as inputs or outputs for MIDI and trigger signals. In PO mode, the Pocket Operator mini synths from the same company are synchronized to the OP-Z.
