Enter the velocity of each frame in order, seperated with a single space:

Enter the number of frames it takes to do another bd after canceling it, include the crouch input frame and include everything before the second back input (do not count the second back input)

Then click this button:

btw the defaults are Clive's backdash and my kbd speed with about 7 years of rust built up lol

The way I got the values was to take a 60fps video of me mashing backdash in training and then I manually put the on screen distance into a spreadsheet (and did some spreadsheet magic to turn distance into velocity)