[PlanetCCRMA] Jack 'time-master' issues

Fernando Lopez-Lezcano nando at ccrma.Stanford.EDU
Wed Jan 28 22:28:28 PST 2009

On Thu, 2009-01-29 at 10:23 +1100, Nicholas Manojlovic wrote:
> Hi All
> I've run into some problems - not sure if they relate to new versions
> of Jack or Ardour, so would appreciate some help. 

Hmmm, I would ask first on the jack-devel or jack-users mailing lists
(and the ardour, maybe it is a known problem). I have not worked with
sync so I don't really know. 

It may be something not completely implemented in jack2 (just guessing)
so it may be a good idea to test with 0.116.x. It is available for fc10
but you would have to force install it as a downgrade...

-- Fernando

> Some particulars:
> $ uname -a
> Linux localhost.localdomain #1
> SMP PREEMPT RT Wed Jan 21 18:14:03 EST 2009 i686 i686 i386 GNU/Linux
> $jackd --version
> jackdmp 1.9.1
> Ardour/GTK 2.7.1
>    (built using 4296 and GCC version 4.3.2 20081105 (Red Hat 4.3.2-7))
> --------
> The problem:
> I use Ardour and Hydrogen together. Ardour is the JACK transport
> master, and Hydrogen is jack-transport aware. 
> Ardour simply refuses to act as the real master - if I try to go to
> the beginning of the session, it will only rewind to where I last hit
> play. To get to the start of the session, I have to unclick Ardour as
> the transport master, rewind, and click it again for Ardour and
> Hydrogen to be in sync. Trying to use Qjackctl as the transport
> control does the same thing. On hydrogen, if I try to go to the
> beginning of the session, it will still play from the last point of
> being stopped. 
> Additionally, if I am running JUST Ardour, and have it set to
> jack-transport, I am unable to locate the playhead to wherever I want.
> It will only play from where it was last stopped. Rewinding does not
> work. 
> I also noticed that using seq24 with freewheeling that seq24 was
> refusing to make itself the jack master despite being told to do so. 
> It is of course, incredibly frustrating and destroys the natural
> work-flow. 
> Any ideas?
> Thanks
> Nicholas
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