Allpass class resources

Source files: Allpass.h, Allpass.cpp.
Parent class for:
Derived from: Filter
Related classes: Allpass1
Example uses: allpass.cpp
References:
 
Dodge, Charles and Thomas Jerse. Computer Music: Synthesis,
     Composition, and Performance. New York: Schirmer Books; 1985. 
     pp. 231-236.