mike@mike-desktop ~ $ lsof | grep dsp
pulseaudi 7060       mike  mem       REG                8,4    73320  9051641 /usr/lib/x86_64-linux-gnu/libspeexdsp.so.1.5.0
gconf-hel 7067       mike  mem       REG                8,4    73320  9051641 /usr/lib/x86_64-linux-gnu/libspeexdsp.so.1.5.0
mike@mike-desktop ~ $ sudo killall esd
[sudo] password for mike:
esd: no process found
mike@mike-desktop ~ $ sudo killall 7067
7067: no process found
mike@mike-desktop ~ $ sudo killall pulseaudi
pulseaudi: no process found
mike@mike-desktop ~ $