[LAU] Installed Fedora17, now trying to play sound

I have a few low-level questions which I am a bit embarrassed by, though hopefully with your help, I can figure a few things out. I recently installed Fedora17 on my machine with the XFCE window manager and I am now just trying to play a sound file with "aplay". The command executes but no sound comes out of my speakers. In addition of the NVidia sound chip on my mother board, I have a M-Audio Audiophile 2496 which is the card that is hooked up to my amplifier/speakers. In the "Applications Menu" there is a "mixer" applications with a "Sound card": drop box with the following options: I assume I don't want the NVidia choice, but which of the others do I choose and why? Also, in the "Applications Menu" there are the following:    "ALSA Mixer"    "Envy 24 Control"    "Pulse Audio Volume Control" Do I want to adjust any of these so that I can hear audio out of my sound card? Thank you.