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The trick is using dmix on loopback device:
2 dmixers; one for regualr onboard audio; the other for loopback virtual device, then duplicates streams send to onboard audio card, so you can hear what is being sent to loopback device.
I recently bought a SoundBlaster Live! 5.1vx to record music in full 24 bits per sample, and so now I have two soundcards - one PCI card and one built-in on the motherboard.
One issue that had been bugging me for a while - not that problematic, but an issue nonetheless - I have Fedora 14 - because modern distros search for and load modules in parallel to speed up the boot process, the result is that the order in which modules will be loaded becomes unpredictable. So, the soundcards...
There had been a weird problem with sound on Arch. Whenever there was a flash item being displayed (or perhaps flash using sound, I suppose), there would be no sound elsewhere. And if there were sound elsewhere, whenever you play something on flash, it would conversely be mute.
The fix is quite simple:
Originally Posted by Wilco
After having some troubles with alsa I managed to fix this once and for all. The problem was I could not run flash+firefox and some other application that uses sound,