On Tue, 16 Oct 2012, [email protected] wrote:

> 
> 
> I found this 2008 rosegarden tutorial by D. Michael McIntyre 
> @ http://www.rosegardenmusic.com/tutorials/supplemental/zyn/zyn.html
> in which he explains how to use the ZYN synth. He begins with 
> launching ZYN and then watching Qjackctl connect it, etc. But 
> rosegarden-11.11.42 can use ZYN without it being started manually 
> i.e. ZYN figures in the synth list. Is there there a difference?
> Is this second condition a result of rosegarden having detected 
> an installed ZYN package and just using it? 
> 
> The reason I'm asking is that sofar I've found only 2 ways to
> get sound from ZYN: via what seems to be the above internal rosegarden 
> selection with rosegarden running, or without jack (and thus without 
> rosegarden) when ZYN is started manually with the command "padsp 
> zynaddsubfx".  
> [OpenSUSE-12.2 in which the jack/qsynthctl/rosegarden combo now 
> otherwise works nicely]. 

There are basicalle 2 ways to start a synth:

1.) as a standalone program. You have to set it up to use the correct
    audio driver. In Rosegarden you have a MIDI instrument as its
    representation.

2.) as a DSSI synth plugin. It integrates into Rosegarden and its JACK
    connection AND it won't suffer from ALSA MIDI latencies. In
    Rosegarden you have a synth plugin instrument.

Fortunately some synths are available both as a standalone program and
as a DSSI plugin, including fluidsynth and zyn.

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