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The Ancient Solfeggio Synthesizer specializes in producing an obscure scale known as the Ancient Solfeggio Tones, which are these frequencies (and their octaves):
There are 4 oscillators, each with its own ADSR, octave transposition, panning, and auto-panning controls. The A, D, and R parameters go all the way up to 20 seconds, for the purpose of making meditation music.