Please remove system-config-sound from firstboot.
It's main purpose (writing ALSA config files) is mostly obsolete these days and
causes more trouble than it does good. For a recent example, see this posting on
the Fedora ML:
It's still good as a test tool for audio, and thus should be kept in the default
install. However, I see no point anymore in showing it to the user on installation.
Audio devices are these days more and more Plug-n-Play. Instead of identifying
audio devices by their ALSA device indexes (that are very difficult to keep
stable properly) they should be identified by device paths, such as the HAL
device path (that is stable all the time). PulseAudio does this now, and
GStreamer does this as well. Thus, the need for stable device indexes is no more.
This will be removed in the next build of firstboot.