The pre-delay is the interval at which the echo of the effect is controlled. The echo is a phenomenon when the time difference between the same sound arrives more than 50Ms. Pre-delay is mainly used to improve the vibrato effect of singing. The range of the tremor frequency of the general singing (interval of sound fluctuations) is between 0.1 seconds and 0.2 seconds. When the pre-delay is less than 0.1 second, the delayer becomes a reverberator, which can imitate the early reflection sound effect, making the sound thicker and heavier.
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