delay1 ugen - not working yet
delay1 works, explicitly pass up to onMulAddInputChanged()
default ugen onInputChanged calls onMulAddInputChanged
some ugens can simply use base onInputChanged if they only call onMulAddInputChanged
Merge remote-tracking branch 'danstowell/onMulAddInputChanged'

* danstowell/onMulAddInputChanged:
  some ugens can simply use base onInputChanged if they only call onMulAddInputChanged
  default ugen onInputChanged calls onMulAddInputChanged
Merge branch 'delay1'

* delay1:
  delay1 works, explicitly pass up to onMulAddInputChanged()
  delay1 ugen - not working yet