hmm, I have a usb audio interface (focusrite Scarlett solo) connected to my
iMac at home and haven’t experienced any audio problems so far with 12.4.
On Mar 31, 2017, at 1:27 AM, Cheryl Homiak <cah4110@xxxxxxxxxx> wrote:
In running the beta, somewhere in between 12.3 and 12.4 I began having usb
audio problems. These first showed up in skype but I find that they also show
up when using usb audio for the system. The sound that you hear when talking
and listening, for example in a skype test, is wobbly chopping sound and you
can hear something that sounds a bit like an idling car when there is
silence. I wanted to record this and put in dropbox for people to hear but
when I tried to record this the sound merely sounded a bit distorted instead
of having a wobbly effect. To try to illustrate, if the word "home" is in a
song held on one note, it is going to sound like ho-o-o-ome. It pretty much
makes usb audio, at least with my Plantronics headset, unusable.
I did some research and found other usb problems in El Capitan and Sierra.
For me this happened in beta somewhere between 12.3 and 12.4. Going back to
12.3 fixed this but going back up to 12.4 betas brought the problem back
immediately. I did report the problem and then withdrew from the beta
program. I hoped that the official 12.4 would fix this but it has not. This
was on my iMac. I also have a Macbook Air and it was not running the beta. It
remained fine on 12.3 but tonight I upgraded to 12.4 and the problem has now
moved in there also. I don't have another usb headset to test this with but
if you are using usb audio I would advise you to be very careful about
upgrading to 12.4. The sound of voiceover isn't as pronounced with this
problem as skype and music listening but there is still some distortion. If
you are using skype, other people will be able to hear the effect so using
usb audio, at least through my Plantronics headset, is useless for others to
listen to and speak in conversation with as it is to me. Both the Macbook Air
and the iMac are from 2012 in case this is a factor. I just thought I should
warn people to at least have a backup if you go to 12.4. I know this is not a
hardware damage problem because if I change to booting from a drive that has
12.3 there is no problem.
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