Fixed typo: 'output-output-map' to 'output-map'.
Fixed incorrectly named var: 'map' to 'output-map'.
Rewrote make-rhythm in pure Clojure. make-rhythm also now takes a map of user-defined sound samples for use in rhythms.
Updated Sticks to allow user-defined sound samples to be used in rhythms and to use the newer pure-Clojure version of make-rhythm.