It's very simple, in fact: the particular subformat of
WAVE-FORMAT-EXTENSIBLE (a structure starting with the usual WAVEFORMATEX
elements) is identified by a GUID* - so one just has to define one for
the new format, and announce it to the world. I plan to do just this
soon (if nobody else does it first!), for the Ambisonic B-Format.
Strictly speaking it can't fit into the mainstream WAVE-EX because the
four (possibly six) channels are not speaker feeds. 

Several concrete examples are given in the Microsoft document (latest
version is now on my website).

*For anyone who doesn't know:
GUID: a 128-bit Globally Unique IDentifier.


Richard Dobson



Michael Gogins wrote:
> 
> The XML format is, by definition, extensible and is, with careful naming of
> tags, to a certain degree self-documenting. If Microsoft has created an
> extensible WAV chunk system that does not require pre-registration, then
> that is a big plus that should be seriously considered. Could you briefly
> explain how it works?
> 


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