record sound kills USB audio output

Luis luis at
Mon Oct 23 20:21:51 EDT 2006

Yep, this is a weird one. I've had it happen with some USB headphone/ 
speaker sets, finally tracked it down to OS X.

Go to: applications/Utilities/ and double-click 'Audio MIDI Setup'

In 'Audio Output' change the frequency setting from where it's at, as  
it has been changed (don't ask me why...). Say change it from 44100  
Hz to 32000 Hz and you should have sound pop back.

Rebooting the Mac resets the setting, which is why it gets erm...  

Let me know if this works/doesn't work in case there's other things  
to look at!



On 23 Oct 2006, at 20:33, Dan Soneson wrote:

> This one's a weird one. I am working on a Macintosh version 10.4.7.  
> I have a set of computers in my language lab that are using  
> Plantronics A-90 headsets with iMics through the USB port. Recently  
> I switched some computers to a Logitech USB headset without the  
> need for an iMic. Both headsets have microphones attached. I have  
> an app that records user voice input using the record sound  
> command. When I record with the Plantronics, everything is fine.  
> However, when I record with the Logitec headset, the microphone  
> works fine and a file is recorded, but the earphones no longer  
> receive sound. In other words, even though the computer sound  
> output is directed to the Logitech USB Headset, we can hear nothing  
> through the headset. In fact, the headset audio is dead until we  
> reboot the machine.
> Has anyone seen this? It's a weird phenomenon, since the system has  
> been working fine until I installed a few of the newer USB  
> headsets. Now I have nothing but trouble. And this only  
> malfunctions when I issue a record sound call from within Rev. The  
> application I have been using was built with Rev 2.6.1, but the  
> problem persists in Rev 2.7.4.
> Thanks,
> Dan
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