evilytwisted@evilytwisted-desktop ~/Downloads $ freqtweak
jackd 0.122.0
Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Quinn, Torben Hohn and others.
jackd comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details

JACK compiled with System V SHM support.
loading driver ..
apparent rate = 48000
creating alsa driver ... hw:0,0|hw:0,0|1024|2|48000|0|0|nomon|swmeter|-|32bit
control device hw:0


ATTENTION: The playback device "hw:0,0" is already in use. The following applications  are using your soundcard(s) so you should  check them and stop them as necessary before  trying to start JACK again:

pulseaudio (process ID 15422)

cannot load driver module alsa
JACK Error: No good client name or JACK server  not running?
Error connecting to jack!
evilytwisted@evilytwisted-desktop ~/Downloads $ sudo apt-get install alsa
[sudo] password for evilytwisted:
Reading package lists... Done
Building dependency tree
Reading state information... Done
Note, selecting 'alsa-base' instead of 'alsa'
alsa-base is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 2 not upgraded.
evilytwisted@evilytwisted-desktop ~/Downloads $