[LAU] (Ardour) How to get rid of delay when recording ? - status so far

[Len Ovens]

On Mon, 15 Feb 2016, jonetsu at teksavvy.com wrote:

> There's an obvious conflict in execution between the jackd that gets
> launched at boot with the -p256 option, and the stored configuration in
> qjackctl that shows buffer size 128.

Jack is not launched at boot. It would not work if it was as it would be 
owned by root.

> My suspicion goes around pulse audio since the pulse jack sink is
> activated.  An emacs grep-find through all /etc/ and its subdirectories

PA does not start jackdbus, it just detects if it is running. Seeing 
jackdbus -auto as a process does not mean it is "runnning" BTW. run 
jack_control status to see.

> only reports two instances of the string 'jackd', in limits audio.conf
> and default.pa (that one being jackdbus).  Still a mystery where jackd
> gets launched, where are the parameters stored.  And, why aren't the
> qjackctl params observed (where would these be stored ?)

Do you have Cadence installed? it may start jackd (or jackdus) at session 
start (not boot).

> The pulse jack sink allows use of, for instance vlc and firefox for
> audio output.

Yes it does, I use it here.

>> In general, starting JACK at boot time is a mistake.
>
> Why would that be ?

At boot time means before session start, which means by some other user 
than you :)

You may mean at session start which is different than at boot. Look for:
/etc/xdg/autostart/cadence-session-start.desktop as a place this might 
happen. If that is so you should be starting and changing jack params in 
cadence not qjackctl. The Cadence autostart can be disabled by running 
Cadence and unchecking the box just below Stop on System tab.



--
Len Ovens
www.ovenwerks.net