Yes, in theory, a synth can generate any sound. Synthesizers create sound by adding or subtracting sine waves using various methods and then shaping the resulting waveform with envelopes and LFOs. With the right settings, a synthesizer can be used to create a wide range of sounds, including sounds that resemble acoustic instruments, sounds that are completely unrecognizable, and even sounds that a physical instrument could never produce. However, it’s important to note that creating a specific sound with a synth can require a deep understanding of how synthesizers work and a great deal of practice.