ps aux | grep pulseaudio

gdm       1228  0.0  0.0 1252932 11544 ?       S<l  00:00   0:00 /usr/bin/pulseaudio --start --log-target=syslog
thor      1688  4.8  0.1 3460264 24276 ?       S<l  00:00   5:17 /usr/bin/pulseaudio --start --log-target=syslog
root     14583  0.0  0.0 119720   964 pts/3    S+   01:50   0:00 grep --color=auto pulseaudio