In the meantime, the onset inlet could be a signal, and the phasor could just be set up like this since onset is just a sum:
[phasor~]
|	\
|	 \
[*~ size/2]
|	   \
|	   [*~ size/2]
|	   |
[tabread4~]
|
64-bit output
I made a version of nusmuk's tabread4c that does this
	-Sebastian