update midi for mapping
add frequency property to blink
tweak bell mode - this may need more work

don't think this will support fixed duration envelopes
too ADSR narrow
basic working spawner
tweak example for new bell mode
bell mode tweak for chases
render fix for chases going high to low
high low chase demo
first pass at hit pulse
second more recursive version of hitpulse

this version will copy elements to show and network and allow 
the individual elements to be altered just for that spawn
add bell mode to reverse chase example
renamed pulse - and factored out abstract pulse
Changed name of basepulse and used as mixin for PulseChase

tad uneasy about going down the mixin road - but
simplifies setting attributes after init for PulseChase
updated examples for pulse chase rename
allow setup_move of chase to be used as a dynamic mover