Jack Control errors

[nnjond]

Hi,

Can anyone help me please?

Evidently I need to run Jack Control in combination with Qsynth to play my midi keyboard. That was ok for about a week or so, then Jack developed a problem. This was solved the first time by me unticking the Realtime box in Jack setup, but that has not worked this time.

Must I rely on Jack just to have my midi keyboard sound?

The errors mssges I recieve are:

Could not connect to JACK server as client.
- Overall operation failed.
- Unable to connect to server.
Please check the messages window for more info.

and;

12:45:12.427 Patchbay deactivated.
12:45:12.480 Statistics reset.
Cannot connect to server socket err = No such file or directory
Cannot connect to server socket
jack server is not running or cannot be started
12:45:12.533 ALSA connection graph change.
12:45:12.971 ALSA connection change.
12:45:44.736 Startup script...
12:45:44.737 artsshell -q terminate
Cannot connect to server socket err = No such file or directory
Cannot connect to server socket
jack server is not running or cannot be started
sh: artsshell: not found
12:45:45.142 Startup script terminated with exit status=32512.
12:45:45.142 JACK is starting...
12:45:45.142 /usr/bin/jackd -r -dalsa -dhw:0 -r44100 -p1024 -n2 -Xseq
12:45:45.153 JACK was started with PID=2008.
Cannot create thread 1 Operation not permitted
Cannot create thread 1 Operation not permitted
jackdmp 1.9.6
Copyright 2001-2005 Paul Davis and others.
Copyright 2004-2010 Grame.
jackdmp 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 server starting in non-realtime mode
Cannot lock down memory area (Cannot allocate memory)
audio_reservation_init
Acquire audio card Audio0
creating alsa driver ... hw:0|hw:0|1024|2|44100|0|0|nomon|swmeter|-|32bit
Using ALSA driver USB-Audio running on card 0 - Alesis Q25 at usb-0000:00:02.0-3, full speed
ALSA: Cannot open PCM device alsa_pcm for playback. Falling back to capture-only mode
Cannot initialize driver
JackServer::Open() failed with -1
Failed to start server
12:45:45.364 JACK was stopped with exit status=255.
12:45:45.364 Post-shutdown script...
12:45:45.364 killall jackd
jackd: no process found
12:45:45.771 Post-shutdown script terminated with exit status=256.
12:45:47.294 Could not connect to JACK server as client. - Overall operation failed. - Unable to connect to server. Please check the messages window for more info.
Cannot connect to server socket err = No such file or directory
Cannot connect to server socket
jack server is not running or cannot be started
12:45:55.100 Could not connect to JACK server as client. - Overall operation failed. - Unable to connect to server. Please check the messages window for more info.
Cannot connect to server socket err = No such file or directory
Cannot connect to server socket
jack server is not running or cannot be started



Thanks for your time

[ubuntuku]

Re: Jack Control errors

You should try it in realtime mode, run the following commands:

sudo dpkg-reconfigure -p high jackd2
# choose yes on the prompt screen
sudo adduser yourusername audio

After reboot, you can check the rtprio and memlock priviliges with ulimit -r -l. The output should look like this:

ubuntuku@satellite:~$ ulimit -r -l
real-time priority       (-r) 95
max locked memory    (kbytes, -l) unlimited

Some info regarding midi sound:
https://help.ubuntu.com/community/Mi...SynthesisHowTo
https://help.ubuntu.com/community/Ho...CtlConnections