Ios AudioKit 4.1-如何正确阻止AKSampler播放音频？

我有两个AKSampler连接到AKMixer，但当我为每个AKSampler调用停止功能时，音频不会停止播放，只有在我调用AKMixer的停止时才会停止播放。如何停止播放连接到AXMixer的AKSampler

示例代码：

func stop() {
   let sampler1 = AKSampler()
   let sampler2 = AKSampler()
   let mixer = AKMixer(sampler1, sampler2)

   AudioKit.output = mixer

   do {
        try sampler1.loadWav("Support Objects/audio")
        try sampler2.loadWav("Support Objects/audio")
    } catch {
        return
   }

    do {
        try AudioKit.start()
    } catch let error as NSError{
        print(error.debugDescription)
    }

   sampler1.play(noteNumber: //some midi number)
   sampler2.play(noteNumber: //some midi number)
   sampler1.stop() // does not stop sampler1 from playing
}

---

使用AKSampler停止注释的首选方法是停止之前启动的特定AKSampler注释

例如：

 sampler1.play(noteNumber: yourMIDINoteNumber)
...
 sampler1.stop(noteNumber: yourMIDINoteNumber)

应成功停止AK采样器