aplay -D hw:0,0 horse.wav does not work

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http://forums.fedoraforum.org – Hi I'm struggling to understand why sound does not work very well on my fedora 17 system. If I run aplay -D hw:0,0 horse.wav I get no sound out. If I run aplay -D plughw:0,0 horse.wav it works If I run Clementine with the Gstreamer audio engine set to Output plugin = Audio sink (ALSA) Output device = hw:0,0 That also works. If I run Totem Movie Player sound does not work. What exactly is the difference between hw and plughw. When I read the link http://www.alsa-project.org/main/index.php/Asoundrc and follow the instructions it basically says that aplay -D hw (HowTos)