I am working within Gnuradio version 3.7.13.4.  As far as I can tell, 
gr_modtool does not support tagged stream blocks for either python or C++.  
Trying to make a new tagged stream block in C++ will create QA code, but does 
not make files for the actual block.  For python it will throw a hard error.  
This appears to be a known issue:  
https://github.com/gnuradio/gnuradio/issues/2489

Can someone point me to some documentation on how to implement an out of tree 
module without gr_modtool?

If this is a non-starter, then here is my problem description.  I am open to 
suggestions on how to solve the problem without an OOT tagged stream block:
I need to implement a block that takes two generated signals with defined, very 
large (~ million sample) packet lengths that are produced at different times, 
align them on a sample-by-sample basis, and adds them.  I know how to do this 
within a tagged stream block.  I am open to ideas on how to do this without 
tagged streams, but I'm not sure how to do sample alignment of large packets 
without having them contained in a tagged stream block work function.

Thank you,
DL

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