Hi, I've been able to run multiple sound cards with ALSA and Rivendell too, and usually with enough attempts I can get USB stuff to work. The biggest issue I run into is having to tweak /etc/asound.conf to lock all the cards down to the same sample rate (very important on cheap cards which like to grab their own sample rate which might be different from other cards on the system) and /etc/modprobe.d/alsa-base.conf to ensure the cards always come up in the same order. I've also run into difficulties with USB based stuff - while it'll mostly work, even when the ID is set in /etc/modprobe.d/alsa-base.conf, I still find that the USB stuff will sometimes grab a different card ID if the system gets rebooted. This isn't a problem on a demo-type system where you can tweak it if a card ends up with a different ID, or if the USB card is the only audio interface on the system (meaning it'll always get the same card ID), but it is not something I would use on a production system.
For a production on-air system, the best in my opinion is to get a decent sound card with multiple outputs. Then you won't run into potential timing/latency issues (that can happen when 2 cards have slightly different clock cycles on their crystals). If you have the funds, an ASI card is one way to go. Otherwise I still recommend that the M-Audio Delta line is a good performer and you can often find these cards on various auction sites for reasonable prices. Lorne Tyndale _______________________________________________ Rivendell-dev mailing list Rivendell-dev@lists.rivendellaudio.org http://caspian.paravelsystems.com/mailman/listinfo/rivendell-dev
