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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, 12 Sep 2010 18:32:54 +0200

Hi David,
some days ago I reported about strange crackling effects using single waveforms. With the new jOrgan release (containing FS 1.1.2 final) the effect appears on other machines, too. Please have a look at the thread in the jOrgan user list:
Many thanks and Regards

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Empfänger: bca
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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