Why do we care about ‘spacing’? The reason is quite simple. It is because spacing is directly related to stamina level of chart. If a chordjack pattern has more spacing, it is likely to be easier in terms of stamina. One should consider the density of spacing to manage the difficulty when stepping a chordjack chart. ^^
‘Axis jack’ is a straight jack with side notes. The straight jack is called ‘axis’ and side notes are called ‘branch’ or ‘leaf’ A side note is called ‘branch’ when there is an axis in the same hand, otherwise, it is called ‘leaf’.
Also, runningman can be also viewed as a kind of axisjack (esp. on high bpm)
On lower bpm, runningman still requires jack motion, but more complex due to OH trill components.
At this posting, I will introduce several concepts such as time line, time layering and margin. Also I will use those concepts to give a more detailed classification of patterns.
Firstly, a ‘time line’ of a note means the time at which the note is, does not depend whether the note is chord or single. (or just regarding a chord as a single note.) A ‘margin’ between two notes means time gap between two time lines according to the notes. The unit of the margin may be a time unit such as ms, s, also can be expressed as a pair of BPM and beat count. (ex. 13.333ms = 200BPM 16th)
Axis already has a name in stepmania terminology: Anchor. and as you mention runningmen, it’s the same thing there ^_^. It’s called an anchor, as it looks like it keeps the other notes in place, like an anchor on a ship
Why do we care about ‘the dab’? Simple, its because the amount of dabs in a file is directly related to the fun level of the chart. if a stream doesnt have many dabs, its likely to be lower in terms of fun. One shouldd consider the density of dabs to manage the fun when stepping a stream chart. ^^