No audio connections for qsynth with jackd1

[intuited]

When using the package `jackd1` instead of `jackd2`, audio connections for qsynth do not appear. They appear neither in qjackctl's Audio tab nor in patchage.

This is somewhat similar to https://bugs.launchpad.net/ubuntu/+source/fluidsynth/+bug/666824 except that that bug report reports that input audio connections do appear; I am not seeing any at all (neither input nor output).

I do see qsynth appear (as "FLUID Synth") in the "ALSA" midi tab.

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System/package details:

Ubuntu 11.10
jackd1 version 1:0.121.0+svn4469-2ubuntu2
qsynth version 0.3.6-1ubuntu2

Note that I've only tried doing this using qsynth rather than fluidsynth itself. qsynth is represented as "FLUID Synth" in qjackctl's ALSA midi tab.

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I've since installed the fluidsynth package and discovered that fluidsynth does work. I ran it with the following command line:

$ fluidsynth -a jack -m alsa_seq /usr/share/sounds/sf2/FluidR3_GM.sf2

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I've now discovered that qsynth actually does appear in the qjackctl Audio tab briefly, then vanishes. This event seems to be concurrent with an xrun. It seems that the xrun causes qsynth to get booted from the audio connections list.

I've also discovered that with frames/period set to 1024 in the qjackctl Setup box, this problem does not occur and qsynth starts up normally.

I'm still confused as to a) why qsynth's startup triggers an xrun (fluidsynth's does not) and b) why this results in qsynth being removed from the audio connections list.

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PS I had frames/period set to a lower number (should that not be obvious from the above comment) because 1024 results in noticeable latency and so is not really ideal.

[Patrice Reich (kbio)]

Hello,

in qjackctl, try to raise the time count to 2000 ms. This solved the problem for me.
Even after switching it back to 200 ms, Qsynth is working fine now.
I'm using Tango Studio (ubuntu 10.04).

Hope this can help,
Best regards,
Patrice Reich