[linux-audio-user] tell ALSA to use secondary card (on USB) instead of primary

I've a nice headphone amp that's connected via USB (*) and it's essentially a second sound card in the system. With XMMS it's pretty easy to tell it to use the second "card": I go to Output Plugin / ALSA / Device settings / Audio device and I choose hw:2,0 Then I go to Device settings / Mixer card and choose USB Audio CODEC. But I'd like to use this "card" also for the Flash plugin in Firefox (wrapped in aoss), and for Xine. Ideally, I'd like all ALSA applications under this user account to use the USB amp instead of the primary card. I'm pretty sure there has to be a way to configure ALSA to direct all apps to the second card by default, but I can't seem to figure out how. Any suggestion is appreciated. (*) - It's actually Headroom's Total BitHead amp, bought together with a Sennheiser HD280 Pro in the "Back to School" package: http://www.headphone.com/products/packaged-systems/back-to-school-sealed.php The amp is based on the Burr-Brown PCM2902E chip which is compatible with a variety of OSes, including Linux/ALSA. The Senn cans are actually amazingly good, at least for the definition of "good" applicable to sealed phones; they sound pretty much like midrange / high end-ish open air phones, with the added benefit of the isolation provided by the closed back. -- Florin Andrei http://florin.myip.org/