Spectral analysis would be a good clue here — sounds like clipping of LF to me

jon

> On 7 May 2018, at 17:30, Gerard Lardner <glard...@iol.ie> wrote:
> 
> I'm very much an amateur here, so please forgive what might be a stupid 
> question!
> 
> I recorded a concert on Saturday (John Rutter's /Gloria /and Karl Jenkins' 
> /The Peacemakers/) using an Ambisonic mic and some others. I'm encoding the 
> A-format to B-format using VVEncode in Reaper, and panning in the extra mics 
> using Wigware Ambipan. The result is then decoded to surround sound or to 
> stereo using VVDecode; all in the same Reaper set-up. I've used this approach 
> before, usually successfully.
> 
> I find that, when the organ and brass are playing at full volume (I mean in 
> the orchestra, not just in playback), there is a 'buzzing' sound in the 
> playback. It sounds harsh, pitched at about 50 Hz. But if I listen to the 
> A-format files alone in Reaper or in VLC Media Player, there is no buzz. 
> Similarly, there is no buzz if I encode the A-format using the stand-alone 
> version of VVMic. The buzz is present both in the B-format from the Ambisonic 
> mic and, less strongly, in the panned B-format from the soloists mic. It 
> appears to be an artefact of my editing configuration; but it didn't happen 
> in a recording I made, using the same configuration, last month. The only 
> difference since then has been that my old hard disc, which had developed 
> some faults, was cloned onto a new SSD.
> 
> Does this description suggest a specific problem/remedy to anyone? I know I 
> can produce a decent CD using the stand-alone VVMic route and panning in the 
> soloists into the stereo mix; but I'd like to get to the bottom of why my 
> Ambisonic configuration is doing this now.
> 
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