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In analog hardware synthesizers, an electric pulse is sent by an oscillator to a sound-emitting device for it to create sound at the desired frequency.
These circuits can vary and there is no specific single component , electrically, that can be pointed to as the "output", it is usually a circuit, which might be integrated into an IC or other device.
Quoting from another answer of mine on an unrelated question https://electronics.stackexchange.com/a/550721/1729
It is important to understand, ahead of time, what your work product is trying to communicate, an electrical design consists of many different documents and deliverables. A schematic as a design asset needs to be specific as possible. It is simultaneously defining the implementation and serves as a documentation for other designers. In extreme cases some professional shops go as far as define a symbol for every part number. A simplified schematic has a different use case (publication in academic paper) than a production worthy schematic.
If you are making certain types of system diagrams it is ok to use generic symbols for various elements. With the knowledge that they convey incomplete information.
For example a pulse source can be pulse square wave inside a circle. Generally a symbol inside a circle is indicating to a reader that there is more complexity inside the device.
