User Agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:36.0) Gecko/20100101 Firefox/36.0 Build ID: 20141116030212 Steps to reproduce: http://www.galaxy-forces.com/web_replay2.php?Level=mission_hard&Place=1 Actual results: Stuttering sound that messes up audio even for other running apps on nthe same machine (or just some clicks on another computer) Expected results: Google Chrome OK Opera OK IE AudioContext not implemented (silent) The entire Dart Project is on (easy to build and test): https://sourceforge.net/p/galaxyv2/code/HEAD/tree/other/web_replay2/ The sound impl on: https://sourceforge.net/p/galaxyv2/code/HEAD/tree/other/web_replay2/web/C_Sound.dart (Dart is compiled into JavaScript run in the browser)

The step to reproduce has changed to http://www.galaxy-forces.com/web_replay2.php?Level=mission_hard&Name=RH Try having another tab open that is playing audio, or "media player classic" playing something for example, then they are silenced while the above address is open in a firefox tab.

Have tracked the issue further and it seems that it is the panning node that causes this problem. oPanner = _m_oAudioContext.createPanner(); //<- if oPanner is remove from the chain sound is ok.

Fixed it by doing this > oPanner.panningModel = "equalpower"; > oPanner.distanceModel = "linear"; > oPanner.maxDistance = 1.1; > oPanner.setPosition(dPan, 0.0, 1.0 - dPan.abs()); Maybe this is the way to do it, but in all other browsers it was working before with only > oPanner.setPosition(dPan, 0.0, 0.0); But it seams wrong that the default panner settings produces clicking/crackling sounds as well as much silence between. Also any audio playing in other applications become silent.

This must be related to our FFT/convolution code being slow (since changing from "HTRF" to "equalpower") "fixes" it. I've filed bug 1157768 to have a better FFT on x86, and bug 926838 is about changing the FFT on ARM.

(also, I forgot to mention that it's know that spending too much time in an audio callback on windows can, depending on the windows version and patch level, break system audio).

Paul, Ronnie: Can we retest this (in Nightly) since so many perf issues including FFT updates have landed? Thanks

Firefox 41.0.1 Firefox 44.0a1 (2015-10-11) Tested and both versions behaves ok! So this issue can probably be closed now.

Thanks Ronnie, closing this now. Feel free to open a new issue if you find other weirdness with Web Audio or anything else !