The Sound System could not be initialized

Question

I am on a MacPro 2014 running 10.11.6 and Xplane 11.01r2 demo mode.  When I start up Xplane I receive the message "The Sound System could not be initialized".  My sound preferences are set to Oppo HA-1 USB Audio 2.0 DAC.  If I change to the internal speakers I do not get the error message, but get no sound.  [There may be none, I'm just going through the first tutorial].

I have deleted the preferences and done an update via the installer.  How do I get it to recognize my DAC?  No problems with sound from any other programs.

Comments

I just checked the log file and I see:

...

CPU count        : 24
0:00:00.000 E/FMOD: /code/design_clean/source_code/engine/sound/soun_fmod.cpp(118): FMOD error 28 - An error occurred that wasn't supposed to.  Contact support.
0:00:02.298 E/SYS: +-------------------------------------------------------------------------------
0:00:02.298 E/SYS: | The sound system could not be initialized!
0:00:02.298 E/SYS: | This could be because your sound hardware was unavailable. Please restart your system and try again.
0:00:02.298 E/SYS: | X-Plane will continue normally though you will not hear any sounds.
0:00:02.298 E/SYS: | 
0:00:02.298 E/SYS: | (hl_init.cpp:1435)
0:00:02.298 E/SYS: 

http://questions.x-plane.com/?qa=blob&qa_blobid=10777795216628568679

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I have the same issue on my Mac mini late 2014.  

GLSL Version     :1.20/120
(16/4096/60/16/16/4096/4096)
This video card is: DX10 or 11 - With instancing
CPU count        : 4
WARNING: tried to open OpenAL driver Built-in Output but we failed. Trying the default driver.
OpenAL devices: Built-in Output
Open AL default device:Built-in Output
WARNING: unable to open any OpenAL device.
0:00:03.918 E/SYS: +-------------------------------------------------------------------------------
0:00:03.918 E/SYS: | The sound system could not be initialized!
0:00:03.918 E/SYS: | This could be because your sound hardware was unavailable. Please restart your system and try again.
0:00:03.918 E/SYS: | X-Plane will continue normally though you will not hear any sounds.
0:00:03.918 E/SYS: |
0:00:03.918 E/SYS: | (hl_init.cpp:1435)
0:00:03.918 E/SYS: +-------------------------------------------------------------------------------

Answer 1

If you're still seeing this I would recommend restarting the computer to see if that helps. Maybe check for any driver updates for the external speakers as well?

Comments

Restarting computer had no effect.  As this is a mac drivers weren't the issue (every other program that uses the speaker is fine.

I did get it to work, however, after installing the purchased version.  Audio now works just fine.  Seems to be an issue with the demo version.