Unison steps (3rd mix) are auto-generated: explanation

[SPUI]

I'm working on a project to make DWIs of all obscure stepsets. So I got to unison on 3rd mix (PSX), and after coding a few I saw patterns. So I worked it out and this is what I found (and thus determined it's a waste of time to code unison steps):

Here, a measure includes the downbeat at the beginning but not the downbeat at the end (the start of the next measure). The first quarter of a measure is the downbeat at the beginning and all notes until, but not including, the next beat. The next beat starts the second quarter of the measure, and so on.

Measures are officially numbered (see edit or training mode for the numbers).

Now say we have a step S in the single steps, and we want to know what it will look like in the unison steps. This step is in quarter Q of measure M.

If M is 6 or less, both sides have S.
If S is the last step of the entire song (not the last quarter, only the last step), the left side gets S rotated right, and the right side gets S. This happens even if the last step is later in a different difficulty.
Divide M by 8 and call the remainder X. If X is between 3 and 6 (inclusive), both sides have S.

Otherwise, divide M by 32 and call the remainder R.
R=7 or 9 => S is on the left side only; the right side is blank
R=8 or 10 => S is on the right side only; the left side is blank
R=15 or 16 => If Q is 1 or 3, S is on the left; otherwise S is on the right; and the other side is blank
R=17 or 18 => If Q is 1 or 3, S is on the right; otherwise S is on the left; and the other side is blank
R=23 or 25 => S is on the left side and S rotated left is on the right side
R=24 or 26 => S is on the right side and S rotated right is on the left side

Otherwise, R is 31, 0, 1, or 2. In that case:
Q=1 => both sides have S
Q=2 => the left side has S rotated left and the right side has S rotated right
Q=3 => both sides have S mirrored
Q=4 => the left side has S rotated right and the right side has S rotated left

Now, Konami decided not to allow all three colors in one row (blue=left only, red=right only, yellow=both). In fact, I don't think yellow and another color are allowed together.
This means that diagonal jumps where R is from 15 to 18 (inclusive) are altered. The left side gets what it should, but the right side only gets the half of the transformed jump that does not coincide with what the left side gets. Thus the left side gets a jump and the right side gets only a step.

[NinJiTSu OLOL!O!1!1]

Yeah!.... wha-
_________________

[Big Matt: Training Mode]

if i was smarter i'd understand that... but good job.
_________________

All of my accomplishments are on 1x Vivid. No, they don't really turn purple.

[SPUI]

A simpler (incomplete) explanation:

The left side and the right side are copies of the single steps, with some transformations.

Every other set of 4 measures, both sides are exactly the single steps.

In the other sets of 4 measures, four patterns cycle; measure 7 is the first one to be transformed (with the first pattern).
The first pattern is to simply remove the first and third measures from the right side and the second and fourth measures from the left side.
The second pattern is to do something similar, but with separate quarters of measures. In the first two measures, the first and third quarters are on the left and the second and fourth are on the right. This is switched for the third and fourth measures.
The third pattern is to rotate the first and third measures left on the right side, and the second and fourth measures right on the left side.
The fourth pattern is really strange. On the left side, the first quarter of each measure is the single steps. The second quarter is rotated left, the third quarter is mirrored, and the fourth quarter is rotated right. The opposite happens on the right side (second quarter rotated right, etc).

The last step is always the single steps on the right side, and the single steps rotated right on the left side.

So, say we have a 21-measure long song. The measures are transformed as follows:

[Catastrophe]

Wow! You were going to code all of the unison steps? You are the man! And doubly so for finding the pattern to auto-generate unison steps for any song.

Five Words: Jam Jam Reggae maniac unison!
( The AMD remix from 3rd mix of course )

[Poochy]

[HoobyJooby]

2+2=4, now I feel smart again