The rhythm machines found on this website all generate analog sounds; the different percussion voices are not samples, they are generated electrically through discrete components. Sometimes, a primitive CPU is used to store the various beats available, or to record and playback a sequence, but this digital circuitry is not related to the actual sound generation, only to note triggering and pattern memory.
Most of the time, these “drum” sounds really don’t sound anywhere near a real percussion instrument: a cymbal sounds like a burst of white noise, a tuned tom sounds like a mono-synth… Which is what makes these machines so unique and interesting, as long as one doesn’t expect to reproduce the natural tone of real percussion instruments, but instead focus on the qualities as synthetic sounds.
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