Bing! Illumination strikes. I think I know what's happening. Some years ago 
you, Fons, when I first got the Brahma, or possibly Ricardo (Richard Lee) or 
Angelo, pointed out that the original 44k1 calibration file for my Brahma was 
corrupt; not the right length; maybe also the 96k file, but I don't record at 
96k. Since then I have used 48k sampling, or a set of calibration file done for 
me by Ricardo. But this year i forgot and had gone back to the original 
calibration file. That's why VVMic stand alone works without the noise - it 
only uses the new calibration file. I'll try/check with the new calibration 
file when I get home tonight. 


Sent from my Samsung Galaxy smartphone.
-------- Original message --------From: Fons Adriaensen <f...@linuxaudio.org> 
Date: 12/05/2018  08:37  (GMT+00:00) To: sursound@music.vt.edu Subject: Re: 
[Sursound] [allowed] Re: Strange 'buzz' in Ambisonic recording 
On Sat, May 12, 2018 at 12:35:56AM +0100, Gerard Lardner wrote:

> I have tried encoding using VVEncode and using X-Volver (in Reaper). The
> effect is there in either case, though it is less obvious when using
> X-Volver. However, I do not hear it at all if I listen to the files through
> the stand-alone version of VVMic. This makes me think I am doing something
> wrong in Reaper.

A had a quick look (more later, have to go now). In the stereo file
there are discontinuities spaced 512 samples or multiples of 512
samples apart. This looks like a problem in the convolution.

Please upload the B-format as well.

-- 
FA


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