The Logic Off Topic list

>  > http://www.crucial-systems.com/code/SDII_format_specification
>
>Got that one thanks Hendrick.

You may also want to check out the Computer Music Journal archives. 
You should be able to find an article from the early 90's which gives 
detailed specs for all audio formats.

here it is:

The article is:

Machine Tongues XVIII: A Child's Garden of Sound File Formats by 
Guido van Rossum

Appeared in the Computer Music Journal - spring '95

very extensive, very detailed