[ardour-users] some questions

Mark Knecht markknecht at gmail.com
Thu Nov 11 07:16:30 PST 2004


Please add 1394 to everything noted below. Good solutions in USB &
1394 would really be welcomed by the laptop community. I'm forced to
go Pro Tools for remote recording right now due to this limitation.


On Thu, 11 Nov 2004 07:12:38 -0800, matt at tinysongs.com
<matt at tinysongs.com> wrote:
> Hi-
> 
> Just a quick $.02 on Ardour and monitoring.  The state of Linux audio I/O using
> USB is far and away behind where PCI is.  It should be important to note that,
> though I really enjoy using Linux for audio and I think Ardour is top notch
> stuff, in configuring a mobile system using a USB audio I/O, and after running
> extensive tests using a 2.8 P4 Linux Laptop (with a gig of ram) runing CCRMA
> 2.4, USB latencies were largely unusable for realtime applications.  (128 or
> greater)  I had to putchase a Mac laptop and use Max/MSP to get the realtime
> latencies to a useable point.  Also there is little effort being made to get
> USB audio in proper shape in ALSA.  This could be an important point for the
> article as many people may be holding out hope for an inexpensive professional
> grade audio production worksataion running open source software and may be
> intending to purchase USB audio I/O devices as they tend to be a bit more
> inexpensive.  Fortunately, Ardour works nicely in OSX and Core Audio now
> (shhh..it's supposed to be kept on the downlow, dig?) though there is no OSX
> port of LADSPA yet so the effects are not running.  (I say "yet" but I haven't
> found anyone who is interested in porting LADSPA effects to OSX and I am not a
> programmer.)  I am keeping my hope alive.
> 
> Matt
> 
> 
> 
> Quoting Jan Depner <eviltwin69 at cableone.net>:
> 
> > On Thu, 2004-11-11 at 07:37, Dave Phillips wrote:
> > > > I'm using Delta 1010...  similar enough...  24/44.1, realtime, and
> > > > whatever combo of buffers & etc. that results in 93ms of latency works
> > > > for me.  I don't mind more latency but Jack won't start with higher
> > > > settings.  No point in lower latency with the monitor mixer feature of
> > > > the Delta cards.
> > >
> > > I'd like to know more about monitoring with a Delta system. What's the
> > > recommended setup ? I assume I want to go with hardware monitoring, but
> > > I'm not completely sure I understand the connections.
> > >
> >
> >       If you're using hardware monitoring you don't need to worry about
> > latency.  Latency is only an issue if you can't use hardware monitoring
> > or you're trying to use your box for real time effects.  When recording
> > I set Frames/Period to 2048 (max for ice1712) because I am monitoring
> > with hardware (no latency).  To run this way just use envy24control to
> > set H/W Out 1 and 2 to Digital Mix L and R.  You get no effects but you
> > also get very few xruns.  If you can stand to hear yourself sing dry
> > this isn't a problem ;-)
> >
> > Jan
> >
> >
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> >
> 
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