Re: [LAU] Heads Up! ZynAddSubFX (Initial Feedback)

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To: <linux-audio-user@...>
Date: Sunday, July 19, 2009 - 11:50 am

Hi list,
on Fri, 17 Jul 2009 15:24:04 +0200 wrote:

> True. I just tried and pushed and in normal use cases there's nothing

I made some tests in the last days as well, but I am not quite as happy -
my system is an AMD64 (Ubuntu 9.04), running on an M-Audio Audiophile 2496
with 256 frames, 48kHz, 2periods.

Yes, there are no xruns in QJackCtl, but I only need to use a rather light
patch like "DX Rhodes 1" from the "Rhodes" group, and by pressing some
"staccato" chords, I can easily create crackles. The CPU load does not go
beyond some 13-15%, and these are no "overdrive" crackles from stacking up
too many voices.

If I record such a "session" in, say, timemachine and analyze the file
afterwards in a sample editor like Sweep, I can clearly detect the
"0-buffers" (I even counted their size manually: exactly 256 frames).
So, while it's certainly great that ZynAddSubFX is not zombified anymore
(and that the fonts finally look ok :-), the fact that I both *hear* crackles
AND *get* them in the recorded file still makes Zyn in a JACK environment
rather useless for me. Now, if THAT could be fixed.. :-).

If I recompile it for standard OSS output, there are no such crackles. So
it's clearly related to JACK mode usage.

As far as I understood from the Zyn mailing list archives, people are trying
to get this fixed, but it's obviously a non-trivial task.

Greetings,
Frank
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Messages in current thread:
[LAU] Heads Up! ZynAddSubFX, Folderol, (Wed Jul 15, 9:32 pm)
Re: [LAU] Heads Up! ZynAddSubFX, Atte Andre Jensen, (Sun Jul 19, 2:27 pm)
Re: [LAU] Heads Up! ZynAddSubFX, Frank Kober, (Mon Jul 20, 11:03 pm)
Re: [LAU] Heads Up! ZynAddSubFX, Folderol, (Sun Jul 26, 9:33 pm)
Re: [LAU] Heads Up! ZynAddSubFX (Initial Feedback), Carlo Capocasa, (Thu Jul 16, 9:06 pm)
Re: [LAU] Heads Up! ZynAddSubFX (Initial Feedback), Frank Kober, (Fri Jul 17, 11:59 am)
Re: [LAU] Heads Up! ZynAddSubFX (Initial Feedback), Frank Neumann, (Sun Jul 19, 11:50 am)
Re: [LAU] Heads Up! ZynAddSubFX, , (Wed Jul 15, 10:09 pm)
Re: [LAU] Heads Up! ZynAddSubFX, , (Wed Jul 15, 11:20 pm)
Re: [LAU] Heads Up! ZynAddSubFX, , (Thu Jul 16, 12:09 am)
Re: [LAU] Heads Up! ZynAddSubFX, Paul Davis, (Thu Jul 16, 1:11 am)
Re: [LAU] Heads Up! ZynAddSubFX, Gabriel M. Beddingfield, (Thu Jul 16, 1:40 am)