Using audacity in fedora 20, Actually I have faced an issue with the audio, strange error as the following one was printed in the terminal:
ALSA lib pcm.c snd_pcm_recover underrun occurred
So in this forum the solution was pointed to restart pulseaudio, which is a proxy sound application:
and then restart
About above command in the forum redirect to this site that explain a little bit further about pulse audio so first need to know your enemy before defeat it.