如何使用网络音频api获得音频跟踪样本的正确幅度（不播放）

I did some experiments with the samples volume data, provided to me by web audio api and it appeares that they are different from the data got from other programs like audasity for example. It shows the duration of audio longer at about 40 seconds if we take divide samples array length to sample rate (leftChannel.length/44100 in my case), and also where audacity shows loud samples in audio, my script shows quiet (almost silent sometimes). And I played pieces reported by my script as quiet in audacity and there is definitely loud sound.I did some experiments with the samples volume