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

[derek holzer]

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
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