I found this in the history of the [email protected]
list regarding Jack setup:

From: Orcan Ogetbil <[email protected]>
Date: Sat, 15 May 2010 03:00:49 -0400
Message-ID: <[email protected]>
To: Rick Green <[email protected]>
Cc: [email protected]
Subject: Re: [LAU] Fedora 12 & CCRMA

...

Assuming you are using Fedora's jack (see above), please remove the lines
you added from limits.conf. Then make sure that your username is in the
jackuser group, and in the pulse-rt group (even if you don't use pulse
this setting won't hurt).

You can add your user to these groups by manually editing /etc/group and
adding your username next to these groups, or by running the
system-config-users GUI application and adding the groups to your username.

Then log-out, log back in or reboot. Now you should have a properly
running jack.

This information is also in the
/usr/share/doc/jack-audio-connection-kit-0.118.0/README.Fedora file. 
Check that file out to see if there is anything else you are missing.

...

Hope it helps, if you decide to go with Jack

.ken

On 07/24/2016 06:18 PM, Onyeibo Oku 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 <[email protected]>
>> 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
>>> [email protected]
>>> https://lists.fedoraproject.org/admin/lists/[email protected]
>>> ct.org
>>>
> _______________________________________________
> music mailing list
> [email protected]
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