[LAU] using Jack an interface to ecasound

john gibby johnalan.gibby at gmail.com
Fri Jan 20 23:41:23 UTC 2017

Ralf, here is the output from dpkg:

i  jack-capture           0.9.71-1                     amd64        program
for recording soundfiles with jack
ii  jackass                1:20140520-1kxstudio1        amd64
 JACK-MIDI support for VST hosts
ii  jackd                  5                            all          JACK
Audio Connection Kit (default server package)
ii  jackd1                 2:0.124.2~20151211-2~xenial1 amd64        JACK
Audio Connection Kit (server and example clients)
ii  jackd1-firewire        2:0.124.2~20151211-2~xenial1 amd64        JACK
Audio Connection Kit (FFADO backend)
ii  jackutils-script       0.0.1avlinux6-1              all          Simple
Start and Stop Scripts to Utilize With QJackctl and Launch a2jmidid and
aloop-daemon - Custom AV Linux Package
ii  libjack-dev            2:0.124.2~20151211-2~xenial1 amd64        JACK
Audio Connection Kit (development files)
ii  libjack0:amd64         2:0.124.2~20151211-2~xenial1 amd64        JACK
Audio Connection Kit (libraries)
ii  libjack0:i386          2:0.124.2~20151211-2~xenial1 i386         JACK
Audio Connection Kit (libraries)
ii  qjackctl               2:0.4.1-1kxstudio2           amd64        User
interface for controlling the JACK sound server
ii  screencapjack-script   0.1.2avlinux8-1              all          A very
basic screen capture script using ffmpeg and jack-capture, the script is
installed to /usr/local/bin and can edited with a text editor. Custom AV
Linux Package

I am using buffer size 128, N=3, 48000hz.  When I use N=2, all I hear is
some clicking.  I don't currently have an external instrument or tuning
fork.  I think the latency problem may be due to the above - seems I
installed things from kxstudio that I didn't realize.  I'm not sure why I
can't use an even smaller buffer size; I guess pianoteq is too cpu

When I take jack out of the equation and play an mp3 file thru ecasound and
the 2-way crossover, it works correctly and sounds good.

By the way, I'm embarrassed to admit that I really have forgotten my admin
password, so I think I need to re-install AVL. That would get me back to
the correct baseline for Jack in AVL.  But then I would have to decide
whether to re-install ecasound - which might have been what corrupted jack
for me??  Or, to forget ecasound and use zita-Irc.


On Fri, Jan 20, 2017 at 8:07 AM, Ralf Mardorf <ralf.mardorf at alice-dsl.net>

> On Fri, 20 Jan 2017 06:59:50 -0500, john gibby wrote:
> >I did searches thru install packages and saw nothing related to jack1
> >that got installed by mistake.
> To list all jack related packages that are installed run
> mkdir /tmp/empty_dir
> cd /tmp/empty_dir/
> dpkg -l *jack* | grep ii
> This doesn't ensure that nothing jack related is in a critical path, if
> you should have installed something without a package or assuming you
> did remove a package without removing all files, that were provided by a
> package.
> >My piano app see's a 128 sample buffer [...] I seem to feel too much
> >latency.
> You started jack with 128 frames and periods are 2 or 3, for a sample
> rate at 44.1 KHz or 48 KHz?
> If so, play a note and check if the tuning at the audio output is
> correct? Use an external instrument tuner or compare the audio output
> with an external instrument or tuning fork.
> Regards,
> Ralf
> _______________________________________________
> Linux-audio-user mailing list
> Linux-audio-user at lists.linuxaudio.org
> http://lists.linuxaudio.org/listinfo/linux-audio-user
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