Please help.

Shortly after I updated OSX to 10.9 the sound of the video lessons is distorted in Safari (but OK in Chrome). YouTube on Safari comes through undistorted.

Any suggestions anyone?

Many thanks!

Wieger

Hi Wieger,

Thanks for the message and sorry for the issue.  I really appreciate all of the detail --- it helps a lot.

Testing different browsers and YouTube was the right choice.  The different browsers check whether or not it's a browser specific problem or one with your OS and/or Sonic Junction.  YouTube is a good test between Flash video (YouTube) and HTML 5 video (Sonic Junction).

Based on your results, it seems like it is a HTML 5 video / Safari issue.  Most likely Safari was updated with your OS.  One quick test

1. what happens if you turn down the volume of the video when viewing it via Safari?

... and one question 

2. does the distortion sound like clipping / overdrive ... or something else?

Thanks and we will get it fixed.

Mike

Hi Mike,

Thank you for your quick response.

In the meantime I found out that the sound is perfect when I use Safari 7.0 with the Apple standard audio driver and the headphone jack on the mac.

Conclusion: the Presonus Universal Control audio driver I am using is not compatible with OSX 10.9 and Safari 7.0.

Funny though that everything works fine with the Presonus driver and Chrome. For the time being, I will use Chrome for Sonic Junction.

Replying to your questions: adjusting the volume has no effect and the distortion is best described as rapid dropouts at a constant rate, like a machine gun.

Next step: I'll check with Presonus for a driver update.

Best regards,

Wieger

Hi Wieger,

Thanks for the details.  Yes, sounds like a driver issue (I had a driver issue like that with the exact same distortion many years ago).  My other idea is that it could be a CPU usage  issue ... meaning Safari is more CPU intensive than Chrome with respect to playing the video ... and therefore causes drop-outs on the audio.  You should be able to view your CPU usage via Activity Monitor.

Good luck and glad you found a solution.