A set of parameter settings, signal routings, and possibly patch cord configurations that produces a particular sound on a synthesizer. The word "patch" stems from the fact that the first mass-produced synthsizers were modular synthesizers, and on these sounds are formed by using patch cords to route signals from one module to another.With the advent of synths with patch memory, this meaning got extended to refer to not only the internal signal routing and switching, but also all of the settable and memory-stored parameters in the synth’s signal processing circuits.

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