[Ardour-Users] Howto firgure settings out

Brett Clark Brett at ciscoinc.com
Wed Sep 19 07:02:52 PDT 2007

This can bring up another question(s).  Im using a Delta 1010 and
use the hardware monitoring (its 'external' in Ardour), so would i
really care about latency?  If im playing back 8 tracks while recording
a 9th track, doesnt Ardour compensate for that?  Also, would a larger
latency reduce the load on the processor?
I currently try to keep the latency down, but these are questions
that have been lingering in my head.


From: ardour-users-bounces at lists.ardour.org on behalf of Svend-Erik Kjær Madsen
Sent: Wed 9/19/2007 2:25 AM
To: martin.lynch at shaw.ca
Cc: ardour-users at lists.ardour.org
Subject: Re: [Ardour-Users] Howto firgure settings out

Hi Martin

Thanks a lot, I've found out that I only can use a limited set of
combinations that's listed in my Digi96/8's manual. But thanks anyway,
it seems that if I aim for very low latency my jack driver give's
up :( Right now I'm working with 23ms latency witch is ok as long as I
monitor inputs which should be recorded externally. I only have a
computer with an AthlonXP 1800 cpu, maybe I should consider an
upgrade ? :)

tir, 18 09 2007 kl. 17:54 -0700, skrev Martin Lynch:
> > Subject: [Ardour-Users] Howto firgure settings out
> > To: Ardour Users <ardour-users at lists.ardour.org>
> > Message-ID: <1190120050.5789.7.camel at STUDIO>
> > Content-Type: text/plain
> >
> > Hey
> > I've just put in a REM Digi96/8 in my computer and attached it to a
> > Behringer ADA8000 interface. I can se all the ADAT ports so it seems all
> > okay so far. But I wonder how I can calculate the best setup for my card
> > so that it uses a minimum of processor time. I've managed to setup my
> > jack with these settings:
> >
> > JACK compiled with System V SHM support.
> > loading driver ..
> > apparent rate = 44100
> > creating alsa driver ... hw:0,1|hw:0,1|256|4|44100|0|0|nomon|swmeter|-|
> > 32bit
> >
> > Is there a simple formular to use to calculate settings such as
> > Frames/Period SampleRate Periods/Buffer.
> >
> > Thanks in advantage
> >
> > /Sv-e
> If what you mean is how to get the lowest latency, I believe the
> formula is:
> (frames per period X periods per buffer) / sample rate X 1000 =
> latency in ms
> Note Ardour often shows a different latency than JACK - not sure yet
> why - initially I thought perhaps it was showing one way rather than
> round trip latency, however my JACK latency shows 2.67ms while Ardour
> shows 0.7ms...I choose to believe Ardour ; - )
> Here's a simple calculator in OpenOffice attached...
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