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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 ~ $