[ardour-dev] Multiple Soundcards?

Dan Tepper dan at wintaper.com
Tue Apr 17 08:03:43 PDT 2007

Thanks to all who replied. Sounds like this is more work and/or involves
trade-offs. Re-sampling is not really an option. I do live multi-track
recording. Currently I can run 26 simultaneous tracks. Was hoping to add
8 more, but I guess this is quite a hassle. Will have to investigate
other ways.


John Rigg wrote:
> On Thu, Apr 12, 2007 at 03:53:26PM +0200, Kjetil S. Matheussen wrote:
>> In the netjack package, there is a program called "alsa_client" or 
>> something similar. Lets say your card #1 is hw:0 and your card #2 is 
>> hw:1, then first start jackd connecting to hw:0, then run the alsa_client 
>> program connecting to hw:1.
>> If you have used qjackctl, you should now see ports for both your cards.
>> Card #2 will resample in software though, so its not the ultimate 
>> solution. But chances are that its impossible to hear any difference 
>> compared to syncing the cards by wire.
> 2 RME cards is a lot of channels. I don't think I'd like to rely
> on software resampling for high channel counts. In fact if quality
> is critical, like in a recording studio, I wouldn't use it at all
> due to the possibility of dropped or duplicated samples as the two
> cards' clocks drift in and out of sync. Hardware sync is preferable
> (and if you can afford it, syncing all your cards from an external
> master clock is better than daisy chaining the cards together).
> John
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