On Wednesday 11 Aug 2004 2:56 am, Silvan wrote:
> What it does affect are any kind of CPU-based synthesizers.  The
> DSSI plugins, and more conventional soft synths too.  They're all
> exhibiting the same symptoms.

What, so something like ZynAddSubFX sees the same problem?

What about Xsynth hosted by dssi_example_host?  That may be the most 
important thing to compare with, actually.

As I'm sure you realise, what you're describing doesn't seem to make 
much sense.  For every synth (standalone or hosted) to suffer hideous 
crackle yet effects plugins to be able to process audio and output 
the results without any trouble at all is very odd.

One thing you could potentially do is examine the actual samples 
generated.  If you look in sound/DSSIPluginInstance.cpp, part way 
through DSSIPluginInstance::run(), you'll see a piece of code that is 
both guarded with an #ifdef and commented out, and that prints out 
all the samples output by the synth.  If you uncomment that and 
define the relevant define at the top of the file, you can then get 
all your samples to stdout (if your terminal emulator is up to it -- 
or redirect to file) and then take a look and see if there are random 
zeros in there, which is what this it sounds a little bit like.  
(Zero samples obviously should be fairly uncommon whenever something 
is actually making noise.)

> I wonder if running in realtime mode would solve this?

I very much doubt it.

It might be worth changing things like the JACK period size.  It's 
faintly possible you've hit a bug that mangles things when the 
buffers are of some particular unexpected size.

As if I had to say so, by the way: I can't reproduce this here...


Chris



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