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Looping

循环 extends the 时值 of 采样 声 played by a 樂/乐 键盘 If the 樂者/乐者 holds down a key the 采样器 should scan seamlessly through the 音符 until the 樂者/乐者 releases the key This is accomplished by specifying beginning and ending 循环 points in the 采样 声波 After the 起（始） of the 音符 is finished the 采样器 reads repeatedly through the 循环 part of the 波表 until the key is 消（去）/释放 then it plays the note's 终 portion of the 波表

创作 a seamless but 自然 循环 out of a 传统 乐器 音 requires care The 循环 should begin after the 起（始） of the 音符 and should end before the 衰（减）

The beginning and ending points of a 循环 can either be spliced together at a common 采样 point or crossfaded A 拼贴 is a cut from one 声波 to the next 切片 波形 results in a click pop or thump at the 拼贴 point unless the beginning and ending points are well matched 交叉淡化 中项 that the end part of each 循环 事件 gradually fades out while the beginning part slowly fades in again The 交叉淡化 循环 过程 repeats over and over as the 音符 is 延（续）