[Ardour-Users] Sync between internal and external sources

[Brett Clark]

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I think there's a terminology issue.  Im not sure he's referring to the
HW 
sync during sampling.  I think he's referring to asking about latency
compensation
when combining a SW like Hydrogen with a real-world recording (like a
mic'd amp)
to be recorded via Ardour.

Ive noticed sometimes when I would be recording and have to "nudge" my
track to
get it back in time. I just had that happen last week when I was laying
a track
with WhySynth and noticed the timing was off.  I chalked it up to the
fact that 
im not a keyboard player and did the nudge. ;-)

- --Brett





- -----Original Message-----
From: ardour-users-bounces at lists.ardour.org
[mailto:ardour-users-bounces at lists.ardour.org] On Behalf Of Mark Knecht
Sent: Wednesday, January 21, 2009 9:21 AM
To: Mark Greenwood
Cc: ardour-users at lists.ardour.org
Subject: Re: [Ardour-Users] Sync between internal and external sources

On Wed, Jan 21, 2009 at 6:50 AM, Mark Greenwood <fatgerman at ntlworld.com>
wrote:
> I've thought very hard about this question and now my head hurts.. I'm
> wondering about how, if at all, Jack/Ardour ensures that all sound
sources
> stay in sync.
>
> Let's assume for the moment that I'm capable of playing an instrument
such
> that I'm in perfect sync with a drumbeat.. (this is a big assumption
but we
> have to start somewhere.. )
>
> I'm using Jack. I have Ardour set to JACK Time Master. I have Hydrogen
set
> up to sync to Jack and play a beat. I have Ardour set up to record me
> playing the bass through my soundcard. I press the Play button -
Hydrogen
> starts playing, I start playing, Ardour starts recording me.
>
> Question 1 : When I play back my recording of me playing bass, and
have
> Hydrogen playing along - are they in sync? Or is my bass part now
delayed
> relative to Hydrogen by a value equal to the latency of my sound card?
>
> Question 2 : When, at a later date, I mix down by recording the output
from
> Hydrogen into tracks in Ardour, does the sync change?
>
> I ask because it sounds like I'm not in sync with my drums but I don't
know
> if it's me.... It might be that the answer to this is so obvious that
I
> can't see it for looking. I do know I can't see it... please help..
>
> Mark



Jack itself really doesn't do anything except use a clock from one of
the sound cards. We have to ensure that every sound card is using the
same clock. By using the right external clock and specifically hooking
it up to all sound cards in all systems they all stay in sync.

It's possible to use a sound card as the master clock if it has the
right outputs. Those outputs *might* be spdif, word clock or ADAT.
(Maybe others but those are the ones I've used) you have to enable the
output to send the clock and then have to enable the other cards to
use that clock instead of its interna crystal.

Hope this helps,
Mark
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