Final answer:
Synthesizer modules that change a sound over time are called Envelopes, which shape how the sound evolves using an ADSR configuration. Oscillators generate sound, filters adjust timbre, and LFOs modulate sound parameters. Function Generators and oscilloscopes can demonstrate sound characteristics.
Step-by-step explanation:
Synthesizer modules that are used to change a sound over time are called Envelopes. Envelopes shape the amplitude, frequency, or other aspects of the sound over time, typically using stages defined as Attack, Decay, Sustain, and Release (ADSR). They do not generate sound by themselves, unlike Oscillators, which are the actual sound generators in a synthesizer. While Filters modify the timbre of the sound by removing certain frequencies, and Low Frequency Oscillators (LFOs) are used to modulate various parameters of the sound at a low frequency, it is the Envelopes that are primarily responsible for how the sound evolves over the course of its duration.
To understand how these components work, a practical demonstration with a Function Generator and an oscilloscope can be very enlightening. A function generator can be used to produce sounds of different frequencies and amplitudes, and an oscilloscope can display the visual representation of these sounds