[ardour-users] Capturing audio with 2 delta1010lt's (chapter2 )

[Nathan_Christensen at BeverlyCorp.com]

The M-Audio web site has the following to say on the subject:

Multi-card

Syncing two Delta Series cards together

Configuring two or more Delta cards together can be done by linking the
cards together through the use of external hardware lock via a 75-Ohm RCA
SPDIF cable to allow synchronization between the cards.

The Basics:

When linking Delta cards, one card sends the master clock signal. The rest
of the cards that are synced must receive signal from the card sending the
signal. The S/PDIF connections on the sound cards are color coded for in and
out. On the Delta series sound cards, the out is white and the in is red.
SPDIF cables can be obtained from any Music Industry store or Home Stereo
store.

Note about SPDIF cables, these cables are not the same type of cabling used
for analog audio, the internal resistance of the cable is different than for
analog audio. Although analog RCA may appear to work, it is not reliable.
Examples of SPDIF cables can be found at www.hosatech.com

1. Connect the 75-Ohm cable from the out (white) S/PDIF connection of card
sending master clock to the in (red) connection of the receiving card. Each
additional card must be hooked in a daisy chain type of configuration.

2. Open the M Audio Delta H/W. The installed sound cards will appear down
the right hand side of the panel. Select the card sending master clock.

3. On the Hardware settings tab of the master card select "Internal Xtal"
for the "Master Clock setting". In the "MultiTrack Driver Devices", please
select "multiple card sync".

4. On the Hardware settings tab of all other synced cards, select "S/PDIF
in" for the "Master Clock setting". In the "MultiTrack Driver Devices",
please select "multiple card sync".

After these steps are taken, the hardware is configured for use. The only
step left to be is setting up your application to use the additional
card(s).


-----Original Message-----
From: ardour-users-ardour.org-bounces at lists.ardour.org
[mailto:ardour-users-ardour.org-bounces at lists.ardour.org] On Behalf Of derek
holzer
Sent: Monday, January 24, 2005 11:51 AM
To: audio lathe
Cc: alsa-user; ardour-users-ardour.org at lists.ardour.org; jackit-devel
Subject: Re: [ardour-users] Capturing audio with 2 delta1010lt's (chapter2)

You'll probably get more feedback from the various lists, but the 
problme is definitiely with the sync. What usually happens when you use 
two different soundcards is that they gradually drift out of sync with 
each other, causing a crash. The keyword to search the ALSA list for is 
"el cheapo", as in "the el cheapo myth", whereby several low cost 
soundcards can be theoretically synced together to make a multichannel 
DAW. The only successful implementation I have heard of for this is to 
physically connect the crystal driving one of the soundcards to all of 
the others, which slaves them all to the main chip. I haven't heard of 
using spdif for this, although nothing screams out at me that it 
wouldn't be possible.

good luck,
d.


audio lathe wrote:

> I found a .asoundrc file for running 2 delta1010lt cards and the 16
> channels appear to be using the jack plugin ok (incidentally Paul
> there was no info in alsa .asound config section on the alsa homepage
> that refered to a ctl section for a jack plugin) and all 16 channels
> appear in ardour :-) with levels etc working ready for recording. Jack
> tells me the rate is 48khz and it is using a 1Mg ramdisk.
> 
>>From this point I can do two things
> 
> 1) If I leave the rate at 48khz (I'm trying to record at 44.1Khz) jack
> runs, I set ardour to record of all 16 channels and shortly after
> arodur crashes complaining about disk streams.
> [ERROR]: Session: error for Audio 1 at frame 263168 (-1)
> [ERROR]: Audio 1: disk stream error at frame 263168 (-1)
> 
> 
> 2) I run envy24control for both the cards, it allows me to sync one
> card off the other using the word clock or sp/diff, however when I do
> that jack crashes with the following errors (it dosen't't matter
> whether I set the rate from the command line)

> Do I need to put a sync section in .asoundrc so that it will work? 
-- 
derek holzer ::: http://www.umatic.nl
---Oblique Strategy # 36:
"Consult other sources
-promising
-unpromising"
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