What is a charge-transfer device and how can it be used to make electronic music? Charge transfer devices represent a rapidly developing area of semiconductor technology which allows one to controllably delay analog signals. The ability to controllably delay an analog signal permits the realization of filters whose characteristics are also controllable. A "flanger" is a typical example of an electronically variable "comb filter." When applied to percussive instruments, it produces a hollow swishy sound akin to that of a jet plane but without the rumble and roar. The flanger, as well as several other applications of analog delays, will be described in more detail later.
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