A synthesizer which is built as an integrated unit, but can have its signal routing altered by the use of patch cords (or, as an alternative, the pin matrix), in the manner of a modular synthesizer. Usually, a semi-modular will have a normalled default signal routing which is in effect if no patch cords are used; inserting patch cords into input jacks overrides the default routing. Well-known examples of semi-modular synthesizers are the ARP 2600, the EMS VCS3 (which used a pin matrix), and the EML Electrocomp 101.

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