Under Linux, a simple approach is to use a loopback (essentially establish a 
Virtual Audio Cable).  The loopback is established by

sudo modprobe snd_aloop enable=1,1 index=10,11

The WJST-X audio input is then plughw:CARD=Loopback_1,DEV=1

and the GNU Radio audio sink device can be left as default.

However, if the intent is to use WSJT-X, there is some extra complexity.  
WSJT-X assumes it is communicating with a transceiver (a rig) and will look to 
check that the rig is configured consistently with what WSJT-X expects.  So you 
need another program that emulates a chosen type of transceiver (eg a Kenwood 
TS-2000) and responds to those WSJT-X checks.   Switching between Tx and Rx 
requires some similar complexity.

Dave

> 
> On ,Thu Jun 06 2024 02:00:06 GMT+1000 (Australian Eastern Standard Time),
> <discuss-gnuradio-requ...@gnu.org> wrote:
> 
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> Today's Topics:
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>    1. Re:  Audio sink to "wire"
> (vitt...@pm.me)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Wed, 05 Jun 2024 12:27:25 +0000
> From: "vitt...@pm.me"
> <vitt...@pm.me>
> To: discuss-gnuradio@gnu.org
> Subject: Re:  Audio sink to
> "wire"
> Message-ID:
> 
> <fHXRxjHHbt8YN_Ml7TgQ03FswD5i3N8jd9iZBFSZg-YUKo7haJFgIvxWLjBaXtWgi1Rt9eR_I0lN1pq0zE6HaPk5WFcBpidPzcxPvyUAXjE=@pm.me>
> Content-Type: text/plain; charset=utf-8
> 
> Hi Jakub and group!
> IMO the
> simplest way to "redirect" audio sink, and that's the solution I usually
> use, use another USB sound card for WSJT-X with an "audio splitter" and
> “physical crossed cable”.
> The audio splitter is only necessary if you want
> to monitor the audio.
> No need for complicated settings, virtual audio
> cable, etc. etc...... fast and dirty!!! 
> 
> Enjoy 
> 
> Vittorio, I3VFJ
> 
> 
> 
> >
> Message: 5
> > Date: Tue, 28 May 2024 06:58:18 +0000
> > From: Šerých Jakub
> ser...@panska.cz
> > 
> > To: "discuss-gnuradio@gnu.org"
> discuss-gnuradio@gnu.org
> > 
> > Subject: Audio sink to "wire"
> > Message-ID:
> >
> paxp189mb167934066abe5023cef7e155dd...@paxp189mb1679.eurp189.prod.outlook.com
> > 
> > 
> > Content-Type: text/plain; charset="iso-8859-2"
> > 
> > Hi,
> > is there
> any simple way to redirect GNU radio Audio sink output to "wire" so that
> it can be processed by some other software (e.g. WSJT-X)?
> > 
> > Thanks for
> any info
> > 
> > Jakub
> 
> 
> 
> 
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