Down up down.... ascending a scale is easy and fast but I could never get the down up down descending right. I can hear a small gap between every string cuz those 2 downstrokes in a row is alot of movement changing strings. But I found somethin wierd where you go down-hammer-up.... And down-pull off-up... descending. But you dont really have to think about the hammers and pulls - they happen so naturally I thought I was alternate picking when I first started doing it. But when I listen to the best gypsy jazz players its so fast I cant tell for sure what they are doing. Do they actually pick every note descending dud dud dud...? Or are they cheating with little slurs in it? I dont mean that its bad to cheat - this trick is so fast I think you should use it sometimes. I think its faster than economy picking. As fast as legato but it sounds more picked.