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 intensive.
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.
Thanks,
John
On Fri, Jan 20, 2017 at 8:07 AM, Ralf Mardorf <ralf.mardorf@xxxxxxxxxxxxx> wrote:
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
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