I sometimes use WSJTX on Mac. WSJTX is set to use USBcodec and Mac internal 
audio to mute.
Having checked current my system setting, its default audio output has been set 
to USBcodec although I have not set so. The audio setting might have been 
changed by system itself. Therefore, I would suggest to check your system 
setting before you play sound on Mac.

73 de JH3SIF, Keith
 
> 2017/04/06 2:58、Dave Fugleberg <[email protected]> のメール:
> 
> John,
> Ok, Windows was a bad assumption on my part.
> You established that the unwanted transmit was due to VOX. That could be
> due to one of two issues:
> A) the radio mic was picking up the sound coming from the computer
> speakers, OR
> B) the Mac is configured to send normal computer sounds to the K3s codec
> instead of the Mac sound card
> 
> If it's A, then turning off VOX is the right dilation and you're all set.
> If it's B, I'd suggest that you configure the Mac to send the default audio
> to its own sound card, and configure WSJT, etc, to use the K3s codec.
> On Wed, Apr 5, 2017 at 12:15 PM Carl Clawson <[email protected]> wrote:
> 
>> If you're running Windows 10, it might be the source of your problem. It
>> has a habit of changing the default audio device when it thinks it's trying
>> to "help" you.
>> 
>> My windows 10 PC has an internal sound adapter and I've always used an
>> external USB device for radio play. As soon as I unplug the speakers from
>> the internal card, Windows 10 decides that it's smarter than I am and
>> redirects the default audio device to my USB adapter. So I leave the
>> speakers plugged in to the PC, or even just an empty phone plug.
>> 
>> If there's a way to make Win10 stop doing this, I haven't found it yet and
>> would love to know.
>> 
>> 73, Carl WS7L
>> 
>> On Wed, Apr 5, 2017 at 9:04 AM, Kevin - K4VD <[email protected]> wrote:
>> 
>>> ​If your default audio device in Sound --> Playback is the sound card
>>> associated with your radio then Windows sounds will be sent to your
>> radio.
>>> 
>>> Your web browser should be respecting the default audio device.
>>> 
>>> 73,
>>> Kev K4VD
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