His Tools are all about Delta. He calculates Volumen Delta imbalances for small Swings . Imbalances are a very common Tool for orderflow Trader and orderflow Charts but with orderflow Charts you looking for clusters in individual candles instead of swings. he Display it in a very nice way . I like his approach and in my eyes it is a nice Tool to use. I would Like a Version for 8.1 If someone knows someone... Feel free to share it