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我有一个应用程序，可以在选择音调按钮时更改音频的音调，现在我正在使用它installTapOnBus来保存文件，但是在我按下音调按钮后会调用此方法，因此仅保存了部分音频，我想保存整个音频无论何时选择音高按钮，有什么办法

此方法用于播放音频

-(void)playAudio
{
    NSError *err = nil;

    audioEngine = [[AVAudioEngine alloc] init];
    AudioFileplayer = [[AVAudioPlayerNode alloc] init];
    pitch = [[AVAudioUnitTimePitch alloc] init];
    reverb = [[AVAudioUnitReverb alloc] init];
    [audioEngine stop];
    [AudioFileplayer stop];
    [audioEngine reset];

    file = [[AVAudioFile alloc] initForReading:[NSURL URLWithString:[self filePath]] error:&err];


    [audioEngine attachNode:AudioFileplayer];

    [audioEngine attachNode:pitch];
    [audioEngine attachNode:reverb];

    [audioEngine connect:AudioFileplayer to:reverb format:nil];
    [audioEngine connect:reverb to:pitch format:nil];
    [audioEngine connect:pitch to:audioEngine.outputNode format:nil];
    [reverb loadFactoryPreset:AVAudioUnitReverbPresetLargeRoom2];

 [AudioFileplayer scheduleFile:file atTime:nil completionHandler:^{
        AudioFileplayer = nil;
    }];

    [audioEngine prepare];
    [audioEngine startAndReturnError:&err];

    if (err != nil) …