I bought a new soundcard, a [Creative Labs SB1570 Audigy FX](https://us.creative.com/p/sound-blaster/sound-blaster-audigy-fx?ctlcmp=CO-US22312), plugged it in, but no sound.  Turns out my expectation was wrong and ALSA outputs to the [first device by default](https://forums.gentoo.org/viewtopic-t-1110794-highlight-.html) which is the on-board sound.  Found some information on outputting to [two devices simultaneously](http://www.6by9.net/output-to-multiple-audio-devices-with-alsa/).