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acq4 acquisition software for the new sensapex system provides a new challenge for running the XOP.

* the minimalist approach is we keep using Igor to set up the ODD and just provide digital triggers via acq4

* gj had some conversations with Luke Campagnola acq4luke.

my conclusion was that we should replace everything in the Igor XOP with python code running the trigger loop in a python subprocess that calls the AIOUSB DLL via ctypes.

* writing to accesio June 2021

* Driver info here https://github.com/accesio/AIOUSB