TGPatternSegment, playPattern: method stub.
Working on playPattern:.
Play Pattern button created and wired up.
Patterns are playing but are currently UNSTOPPABLE!!!!
stop now stops patterns in addition to normal tones.
Cleanup.
Vaguely-mouse-chirp-sounding randomChirps pattern (as a test, and for another project).
Shorter, non-repeating randomChirps.