Re: [fluid-dev] Re: What is the best way start fluidsynth with zero/low latency? (Louis B.)

[Louis B.]

I have update the wiki to read

<q>First you need to reduce the CPU usage which helps reduce the
chances of data under-run which causes the audio cut out. This can be
done by turning off the Reverb and Chorus with the flags '-C0 -R0' and
also by halving the sample rate with the flag '-r22050'. </q>

I have just retested it and halving the sample rate helps more than
removing the Reverb and Chorus with the under-run.

I am running on an eeePC 901 + EEEBUNTU

On Sat, May 23, 2009 at 8:08 PM, Pedro Lopez-Cabanillas
<address@hidden> wrote:
> 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?
>
> Regards,
> Pedro
>