USB Sound Device as Default

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http://www.linuxquestions.org – I have both motherboard audio and a MusicStream USB DAC on my machine. I can get output through the Mobo audio by cat'ing an audio file to /dev/dsp or /dev/audio. The only way I've found to get sound out though the USB device so far is to use the ALSA Output plugin in XMMS to select the MusicStreamer as the hardware device. Can I somehow set so everything goes out through the USB device? (HowTos)