[jOrgan-user] Report on Balzan and Fontana

[John Reimer]

Hi all,

In a recent post which I haven't yet located, I said that I couldn't use the
two Maltese organs along with portaudio, as there was a Fluidsynth failure.
It meant that I couldn't have the excellent latency and reverberation I am
used to at my home organ console. I am very pleased to report that I have
now identified the problem - those VPO's come with a Sample Rate of 48 kHz,
instead ot the 44.1 KHz I normally use. One of a number of traps for the
unwary. So here is one of the details you need to check if you are having
problems getting Fluidsynth to work.

John Reimer




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[John Beach]

When portaudio first was made available to us, we were told that the 44,100
(default) setting in Fluidsynth would need to be changed to 48,000. I can't
remember if Sven told us this, or Bernd or Graham G. But, we were informed.

John B.

[John Reimer]

Post by John Beach
When portaudio first was made available to us, we were told that the 44,100
(default) setting in Fluidsynth would need to be changed to 48,000.

JohnB,

I don't think that is the full story, since my portaudio backends work very
well with 44.1 KHz, especially now that I've spotted the discrepancy in my
system and remedied it. What is important is that the sample rate should
line up with whatever rate applies to any soundcard in use. If there is such
a requirement regarding 48 kHz, it may apply to special cases, but we need
someone more in the know to post about it.

John Reimer




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[John Beach]

"it may apply to special cases, but we need
someone more in the know to post about it."

I think that would be Sven.

John B.

[Graham Goode]

Remember that the PortAudio backend supply ASIO, WASAPI, and WDM-KS drivers depending on which version of the backend you have downloaded.



WASAPI requires that your Fluidsynth driver sample rate equals the sample rate that your sound card is configured for.



Some ASIO drivers do too.



WDM-KS is usually more forgiving, but in some cases (sound card driver dependent) you'll need to match sample rates as well.



So there is no single definitive answer. It depends on the drivers.



GrahamG

[John Reimer]

Post by Graham Goode
So there is no single definitive answer. It depends on the drivers.

Thank you, Graham.

John Reimer




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[John Beach]

I was simply reiterating what we were told at the time. I have also found that my samples which are all 44.1K work in Fluidsynth Portaudio at a setting of either 48K or 44.1K. Where I found
severe “snap, crackle and pop” was when I converted them all to 96K and set the audio card and Fluidsynth for 96K. I had to increase the buffer size in jOrgan Customizer to 3072 in order to
get rid of the “snap, crackle and pop.” Then I read up on the subject and realized that there was no advantage to be gained by avoiding the default 44.1K.

John B.