Loud clipping sound when playback ends, what could be the cause?

[bali182]

Hello, I'm using the default soundfont (soundfont/sonivox.sf2) in the browser. It works great, the only issue I'm experiencing, is that when the playback ends there is a loud clipping/clicking noise. If I had to guess, whatever is playing the samples zeroes / mutes whatever is playing, and that's causing it. It's quite apparent with the bass samples, here is an example (play button on the bottom middle of the screen):

https://bali182.github.io/stick/#/default/score

It can be heard when the last bar ends, and it's different how loud the click/pop is on every playback. This is my player config:

const playerConfig: json.PlayerSettingsJson = {
  scrollElement,
  enableCursor: true,
  enableAnimatedBeatCursor: true,
  enableElementHighlighting: true,
  enablePlayer: true,
  enableUserInteraction: true,
  soundFont: 'soundfont/sonivox.sf2',
}

And this is how I start the playback, nothing fancy:

api.playPause()

Any ideas why this is happening? Am I missing something with the player config? It happened in the previous major version, and the newest beta one as well, which I'm using currently.

[bali182]

Upon investigating a bit, it seems like it may be a WebAudio issue. I found an article that demonstrates the issue with a sine wave, and some potential solutions:

https://alemangui.github.io/ramp-to-value

Is it possible to get access to the "low level" WebAudio components, that AlphaTab uses under the hood, to apply the gradual gain fade?

I see that the implementation of IAlphaSynth has references to some webaudio types, which I can get access to, but I'm not really sure when would it be appropriate to apply the gain fade.

const output = (api.player as any)._output as any
const context: AudioContext = output._context
const buffer: AudioBuffer = output._buffer
const source: AudioBufferSourceNode = output._source

[Danielku15]

I improved this already in the past various times. Generally the problem is if some audio buffers are out of sync within alphaTab.
See #1330 and #1298

Seems there is still a case where the timings internally get out of sync. This leads to the problem that invalid samples are played. I entered #1599 to look at this closer again.

I will try to fix this at its core on the audio generation. But also beside that there should be a way to prevent any noises even if the times get out of sync. I have to see the performance impact of clearing certain buffers to play "silence" in such cases.

[bali182]

Great, sorry I missed the previous issues, probably used the wrong search terms. Thanks for looking into this!