However, the range of human hearing is about 10 octaves, and any reasonable synth VCO is expected to operate over a range of at least five octaves to be musically useful.

• 但是人的听觉范围大约是10个倍频程，因此人们希望任何合理的合成器VCO其操作范围至少应有5个倍频程，以达到音乐方面的有效性。