Steps to reproduce: 1. Navigate to http://webaudioplayground.appspot.com/ 2. Create an AudioBufferSourceNode and a DelayNode. 3. Connect the nodes. 4. Press the Play button on the AudioBufferSourceNode. 5. Change the sound while the one from step 4 is still playing (eg: play glass-hit.ogg and change it to drums.ogg) 6. Press the Stop button. 7. Repeat steps from 4 to 6 a couple of times. Expected results: Sound is played. Actual results: No sound is played. Notes: 1. Reproduced this issue with the Try build (Build ID: 20130930145650) from https://bugzilla.mozilla.org/show_bug.cgi?id=921457#c9 on Windows XP, Ubuntu and Mac OS X: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:27.0) Gecko/20100101 Firefox/27.0 Mozilla/5.0 (Windows NT 5.1; rv:27.0) Gecko/20100101 Firefox/27.0 Mozilla/5.0 (X11; Linux i686; rv:27.0) Gecko/20100101 Firefox/27.0 2. Cannot reproduce this issue with the latest Beta, Aurora and Nightly builds due the existence of bug 921457. 3. This issue is intermittent and reproducible only when the DelayNode is present. 4. I can reproduce this issue before the changes landed for bug 910174, but see Note 2, down to Nightly 23.0a1 (2013-04-05). In Nightly from 2013-04-04 there are no sounds when DelayNode is present. 5. Works on Chrome.

Thanks. This is due to different channel counts in the different buffers. It works if waiting between pressing the stop button (6) and play button (4) but not if the time between the two is less than the maximum delay of the DelayNode, which defaults to 1 second. Bug 857610 tracks supporting different channel counts in DelayNode.

(In reply to Alexandra Lucinet, QA Mentor [:adalucinet] from comment #0) > Steps to reproduce: > > 1. Navigate to http://webaudioplayground.appspot.com/ > 2. Create an AudioBufferSourceNode and a DelayNode. > 3. Connect the nodes. > 4. Press the Play button on the AudioBufferSourceNode. > 5. Change the sound while the one from step 4 is still playing (eg: play > glass-hit.ogg and change it to drums.ogg) Now double click quickly on the STOP button AR: No sound ER: Second song should play