Then i started following this guide to setup jack+cadence:
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http://libremusicproduction.com/articles/demystifying-jack-–-beginners-guide-getting-started-jack
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Failed to start JACK, please check the logs for more information.
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Mon Jan 1 22:16:55 2018: ------------------
Mon Jan 1 22:16:55 2018: Controller activated. Version 1.9.11 (unknown) built on Mon Mar 27 23:44:11 2017
Mon Jan 1 22:16:55 2018: Loading settings from "/home/user/.config/jack/conf.xml" using expat_2.2.2 ...
Mon Jan 1 22:16:55 2018: ERROR: failed to stat "/home/user/.config/jack/conf.xml", error is 2 (No such file or directory)
Mon Jan 1 22:16:55 2018: ERROR: open() failed to open conf filename.
Mon Jan 1 22:16:55 2018: Listening for D-Bus messages
Mon Jan 1 22:20:20 2018: ------------------
Mon Jan 1 22:20:20 2018: Controller activated. Version 1.9.11 (unknown) built on Mon Mar 27 23:44:11 2017
Mon Jan 1 22:20:21 2018: Loading settings from "/home/user/.config/jack/conf.xml" using expat_2.2.2 ...
Mon Jan 1 22:20:21 2018: ERROR: failed to stat "/home/user/.config/jack/conf.xml", error is 2 (No such file or directory)
Mon Jan 1 22:20:21 2018: ERROR: open() failed to open conf filename.
Mon Jan 1 22:20:21 2018: Listening for D-Bus messages
Mon Jan 1 22:20:25 2018: Saving settings to "/home/user/.config/jack/conf.xml" ...
Mon Jan 1 22:20:37 2018: Saving settings to "/home/user/.config/jack/conf.xml" ...
Mon Jan 1 22:21:01 2018: Saving settings to "/home/user/.config/jack/conf.xml" ...
Mon Jan 1 22:21:03 2018: Starting jack server...
Mon Jan 1 22:21:03 2018: JACK server starting in realtime mode with priority 10
Mon Jan 1 22:21:03 2018: self-connect-mode is "Don't restrict self connect requests"
Mon Jan 1 22:21:03 2018: ERROR: Cannot lock down 82274202 byte memory area (Cannot allocate memory)
Mon Jan 1 22:21:03 2018: Acquired audio card Audio0
Mon Jan 1 22:21:03 2018: creating alsa driver ... hw:PCH,0|hw:PCH,0|1024|2|48000|0|0|nomon|swmeter|-|32bit
Mon Jan 1 22:21:03 2018: configuring for 48000Hz, period = 1024 frames (21.3 ms), buffer = 2 periods
Mon Jan 1 22:21:03 2018: ALSA: final selected sample format for capture: 32bit integer little-endian
Mon Jan 1 22:21:03 2018: ALSA: use 2 periods for capture
Mon Jan 1 22:21:03 2018: ALSA: final selected sample format for playback: 32bit integer little-endian
Mon Jan 1 22:21:03 2018: ALSA: use 2 periods for playback
Mon Jan 1 22:21:03 2018: ERROR: Cannot use real-time scheduling (RR/10)(1: Operation not permitted)
Mon Jan 1 22:21:03 2018: ERROR: AcquireSelfRealTime error
Mon Jan 1 22:21:08 2018: ERROR: JackPosixProcessSync::LockedTimedWait error usec = 5000000 err = Connection timed out
Mon Jan 1 22:21:08 2018: ERROR: Driver is not running
Mon Jan 1 22:21:08 2018: ERROR: Cannot open client name = dbusapi
Mon Jan 1 22:21:08 2018: ERROR: failed to create dbusapi jack client
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https://linuxmusicians.com/viewtopic.php?f=47&p=81243
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http://appstore.deepin.org/app/cadence