Re: [fluid-dev] [Rosegarden-devel] Problems With Rosegarden Using Qsynth or Fluidsynth When Using PulseAudio Instead Of JACK

[Aere Greenway]

On 01/30/2013 12:33 AM, Holger Marzen wrote:
> On Tue, 29 Jan 2013, Aere Greenway wrote:
>
> > Rosegarden and Fluidsynth Developers:
> >
> > In working with Fluidsynth problems, the Fluidsynth developers have
> > wondered why I insist on using JACK with Qsynth, rather than just
> > configuring it to use PulseAudio.  Yesterday I finally found out why I
> > do this, but what the cause of the problem is, possibly both sets of
> > developers (together) might be able to postulate.
> >
> > Here are the steps of a test you can do to illustrate the problem:
> >
> > 1. Configure Qsynth to use "pulseaudio" instead of "jack".  Even doing
> > this can cause hangs if you have more than one engine configured.  Best
> > approach is to not restart the engine when it prompts you, instead,
> > terminating Qsynth, and bring it back up after completing the
> > configuration changes.
> Using Pulse and JACK works here by disabling Pulseaudio clients to start
> it (autospawn = no in /etc/pulse/client.conf) and starting Pulseaudio in
> QjackCtl. See http://www.marzen.de/Holger/pulseaudio_and_jack/
>
> Fluidsynth is available as a DSSI module to be used in Rosegarden. No
> problems at all AND lower latencies.
Holger:

Thanks to your information, I was able to make my Soundblaster Live 
emu10k1, the Java Sound (Gervill) synthesizer, and Qsynth all co-exist 
nicely using JACK (QjackCtl).  Also, I now don't have to have my music 
player set properly to use JACK, or to use PulseAudio - it plays with 
either one.  I also have probably eliminated the hangs (time will tell).

The thing that made the difference was that in the mixer (pavucontrol in 
the case of Lubuntu), I had to set the PulseAudio JACK Sink as the 
fallback (primary) sound card, rather than the Soundblaster Live.  I 
didn't need to manually change any system configuration files to make 
this work (so far).

The only thing that doesn't work together with JACK is the Flashplayer 
(for YouTube Videos).  I have to terminate QjackCtl to play one of those 
and have sound.

Thanks again for your helpful information.

--
Sincerely,
Aere