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Re: [fluid-dev] Re: What is the best way start fluidsynth with zero/low

From: josh
Subject: Re: [fluid-dev] Re: What is the best way start fluidsynth with zero/low latency? (Louis B.)
Date: Sun, 24 May 2009 23:51:56 -0400
User-agent: Internet Messaging Program (IMP) H3 (4.1.6)

Quoting Pedro Lopez-Cabanillas <address@hidden>:
On Saturday, May 23, 2009, Louis B. wrote:
Thanks for the info. I have just update the wiki with information on
how to run fluid on a netbook. see
http://fluidsynth.resonance.org/trac/wiki/LowLatency. Please correct
it if it is wrong or you want to add anything else.

"Also halving the sample rate with the flag '-r22050' helps a lot."

I doubt the above advice would be beneficial for latency. On the contrary,
running FluidSynth with a native sound card sample rate will give the better
results, because reducing the sample rate requires ALSA to perform software
interpolation (by the plughw: layer) to transform the buffers into the native
frequency before sending it to the hardware. This requires larger buffers and
consumes CPU cycles. On the other hand, using the native frequency allows you
to use the hw: interface directly.

By the way, which netbook are we talking about? Which Linux distro?


If the system is running out of CPU and the sound card actually works with 22050 natively, then it could help reduce CPU usage, thus preventing CPU starvation. Another idea is to decrease synth.polyphony in that case though.


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