Audio produces an echo if (a) it is started in an animation and (b) the presentation is shown on multiple display with presenter console.
I don't know the earliest affected version. This happens with 18.104.22.168 and 22.214.171.124.
Steps to Reproduce:
Add two audio files (Insert -> Audio or Video), create an animation such that:
* The second audio is toggled (not played) at first.
* After a click, stop the first audio and toggle (play) the second.
Start presentation with multiple displays and presenter view.
I'll attach a demo presentation.
The first audio is played without echo.
The second audio is played with echo.
Both audios should be played without echo.
User Profile Reset: No
Workaround: Switch the presenter's view from single slide to slide overview (click Slides).
User-Agent: Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:50.0) Gecko/20100101 Firefox/50.0
Created attachment 132074 [details]
Impress test demo
Win 7 Pro 64-bit Version: 126.96.36.199.alpha0+ (x64)
Build ID: 1f73ac90da31b62ccf6f040c68e5c0150171240f
CPU threads: 4; OS: Windows 6.1; UI render: default;
TinderBox: Win-x86_64@42, Branch:master, Time: 2017-04-20_07:32:30
Locale: fi-FI (fi_FI); Calc: CL