Trevor Wishart’s Audible Design is a big point of reference and aspiration for me as I’m developing learning resources. For those that don’t know the book, it’s a very musically-orientated how-to book for sound processing as-it-was-possible in the mid-90s, with lovely, clear diagrams and sound examples.
Apparently it’s been out of print for a while, and Trevor Wishart has now decided to make it available electronically: http://www.trevorwishart.co.uk/AuD.html
Huzzah.