如何使用AudioKit的新AKSequencer播放MIDI

Question

我使用的是AudioKit 4.9.1，无法用新的AKSequencer (取代AKAppleSequencer)播放MIDI文件。没有声音播放。假设MIDI文件和示例已正确加载，因为它们以前使用过AKAppleSequencer。背景音频模式功能也已启用。

下面是相关代码：(我也尝试了AKSampler和AKAppleSampler，但结果相同)

class MIDIPlayer {
    var sampler: AKSampler
    var legacySampler: AKAppleSampler
    var sequencer: AKSequencer

    init(withSfz sfz: String, orSf2 sf2: String, andMidiFile midiFile: String) {

        self.sampler = AKSampler()
        self.legacySampler = AKAppleSampler()
        try? legacySampler.loadSoundFont(sf2, preset: 0, bank: 0)
        sampler.loadSFZ(url: Bundle.main.url(forResource: sfz, withExtension: "sfz")!)

        AudioKit.output = sampler
        try? AudioKit.start()

        sequencer = AKSequencer(targetNode: sampler)
        // sequencer = AKSequencer(targetNode: legacySampler)

        let midi = AKMIDIFile(url: Bundle.main.url(forResource: midiFile, withExtension: "mid")!)
        sequencer.load(midiFile: midi)
    }

    func play() {
        sequencer.playFromStart()
    } 

在如何设置我缺少的信号链方面有什么不同吗？

Answer 1

有了新的定序器，它必须是信号链的一部分。所以，做一些像这样的事情

let mixer = AKMixer
sampler >>> mixer
for track in sequencer.tracks { track >>> mixer }
AudioKit.output = mixer

它应该是有效的。很抱歉在Github问题上延迟看到这篇文章。