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Re: Re: [fluid-dev] FS 1.1.2 alpha sound rendering issue

From: Bernd Casper
Subject: Re: Re: [fluid-dev] FS 1.1.2 alpha sound rendering issue
Date: Sun, 22 Aug 2010 11:48:12 +0200

Hi David,
I think the issue has resolved. Observed more carefully, altering buffer parametres influences the crackling effect, yet.
Compared with FS-1.1.1, I have to increase the buffer settings on my system now up to two units. I didn't realize, that FS-1.1.2 handles not all programs of the same soundfonts the same way now. Some do crackle, some not.
The programs were handled completely correct with 7/384 in FS-1.1.1. The same programs now need to be handled with 8-9/384, in FS-1.1.2. Using 7/384 here, lets appear the crackling on some programs, but not in all. This was worrying me, since up to FS 1.1.1 I was used to expect a crackle either in all or in no programs of one and the same FS instance.
I just researched the API, but I didn't found which default settings FS uses for count of buffers and buffer size.
Did you apply a change in the code which can cause the necessity to increase the buffers? Those settings a essentially for working out the most small latency, in a real-time scenario on a certain system. So of course latency is increased now by the changes I mentioned above.

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Zeit: 2010-08-19, 21:47:48
Betreff: Re: [fluid-dev] FS 1.1.2 alpha sound rendering issue
2010-08-17 15:39, Bernd Casper skrev:
> Hi David,
> FS 1.1.2 delivers currently strange rendering issues. Strange though, not all sounds are affected, and even more strange, the crackling disappears if more keys are pressed (as shown in the example). Here's a sample of one and the same program, which is very good in serving as reference sound. First you listen to FS, second Creative Synth (SB Live Platinum). Note also the presence of the attack and rich sound and buzz in Creative rendering. The wave is converted to ogg with 256KB/s, so it's nearly lossless.
> http://bca.free-artists.net/data/tempdl/bca_FS112alpha_rendering_test_clairon4_FS1st_Creative2nd.ogg
> I also observe ticks a quarter of a second after releasing keys, as whether releases cut off with a tick.
> Playing with parametres gives no improvement.

Thanks for the testing, Bernd. I would need a little more information to
be able to solve these bugs.

 * Do you also have the sf2 used to render these files?

 * The initial crackling sounds like underruns, what are your audio
output options in this rendering example?

 * The difference in what you call "richness" between the two examples,
sounds like either difference in handling cutoff, or chorus, or a
combination. I'm not sure though, and I believe S Christian Collins is
our expert on this matter. Christian, perhaps you have some thoughts
about this issue?

// David

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