[Discuss-gnuradio] set_output_multiple() and forecast() when there are multiple sources in a general block

[Tom Early]

I am designing a general block that will split it's input into two 
outputs. 96 input items will become 9 items on one source and 3 items on 
another source. I have some questions:

Is it required to set both streams in forecast()?

How do I call set_output_multiple() where there are multiple sources, 
the larger stream, the first stream, the sum or what?

When general_work() is called, is noutput_items for one stream or 
something else?

Thanks!