I guess you want to start by Googling phrases like "pipe audio in linux to file". It will probably be as simple as a command line. 



On Mon, 25 Jul 2016 at 11:18 Onyeibo Oku <twohotis@gmail.com> wrote:
I don't how to go about setting up JACK.  I couldn't find a page
dedicated to it within the Fedora community.  All I get from qjackctl
are:

02:15:49.135 JACK was stopped
02:15:51.113 Could not connect to JACK server as client. - Overall
operation failed. - Unable to connect to server. Please check the
messages window for more info.
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started



On Sun, 2016-07-24 at 20:10 +0000, Brian Monroe wrote:
> Have you tried using Jack at all? If so, can you send us your Jack
> settings?
>
> On Sun, Jul 24, 2016, 12:34 PM Onyeibo Oku <twohotis@gmail.com>
> wrote:
> > *BUMP*
> >
> > Is this list still active?
> >
> > I've been unsuccessful in different attempts to route playback from
> > my
> > soundcard to an output file (preferably WAV format).  I have tried
> > arecord, sox etc.
> >
> > Could someone guide me through this process?
> >
> > Regards
> > Onyeibo
> > _______________________________________________
> > music mailing list
> > music@lists.fedoraproject.org
> > https://lists.fedoraproject.org/admin/lists/music@lists.fedoraproje
> > ct.org
> >
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