Here is a cliche computer music paper with some context. Apologies in advance if it is too off topic.
“The Digital Computer as a Musical Instrument” By Max Mathews in 1963 is probably (one of) the first published papers on computer music.
I only mention it because even then, you could see the influences that analogue modular synthesis had in digital music making.
In a particular section, he talks about building instruments in MUSIC N (known as the “orchestra”), and basically describes a simple modular patch:
The interconnected blocks of program which make up the instrument unit are called unit generators. There are a number of different types of unit generators, each of which has a specific function. A typical instrument unit is shown in Fig. 2. This instrument-unit is composed of five unit generators; three of them are oscillators, one is a random number generator, and one is a summing circuit. Each oscillator has two inputs and one output. The upper input specifies the amplitude of the output; the lower input specifies the frequency of the output. The wave shape of the output need not be sinusoidal and can,indeed,be any one of 20 arbitrary functions stored in the computer memory. In the example given,the wave shapes are sketched on the oscillators,oscillator 1 producing a damped sinusoid, oscillator 2, a triangular attack-and-decay function and oscillator 3,a sinusoid.
Nearly six decades (!) later, it’s easy to dismiss this because that’s just how we do things now. However, keep in mind that two years before, John L. Kelly and Carol C. Lochbaum had created the first computer-based physical model of a musical instrument: the singing voice , which is conceptually a very different approach to instrument design. Had things gone just a bit differently, perhaps computer music today would consist of people building instruments using virtual wood, steel, and glass materials, rather than connecting modules together using virtual cables.