Just like how you can alternate between rhyme sets to create a rhyme scheme, you can alternate between flow patterns to create a flow scheme. However, the techniques for accomplishing this are different because rhyme sets are visually based while flow patterns are kinetically based. The way you can create flow schemes is by creating a motive.
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Motives are musical ideas that are repeated throughout a piece. For example, here Tech N9ne creates a motive with the word "naaarr-cis-sis-tic" as the rhythm echos throughout his entire second verse. Here are some more examples of motives at work in rap.
TRYING TO COMBINE MORE THAN ONE ADVANCE TECHNIQUE IS INCREDIBLY DIFFICULT. WE SUGGEST MASTERING ALL INTERMEDIATE SKILLS THEN JUST ALTERNATING BETWEEN THE ADVANCE ONES...
Learning how to create motives is easy enough with the scat method. You can already create arbitrary rhythms and match them. Now, all you have to do is remember one of those rhythms. Easy enough, right? You can pull out that rhythm at any point that feels right to you while freestyling. As long as you remember that rhythm, you've got a motive! You can even juggle multiple motives at a time. That's one way to create a flow scheme.
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Another way to create a flow scheme is to juggle base rhythms. To start let's pick a fast scat pattern and a slow one. Assuming each of your patterns covers 4 counts, just mix and match them in various forms. This also creates a flow scheme.
What you were just doing in the last paragraph is called unparallel flow. Parallel flow, as opposed to unparallel, is what we taught in Flow II. We matched the same flow pattern from line to line then switched at some point. Here we're doing something fundamentally different. We're not using identical patterns but rather basing each new bar off of a combination of two existing patterns. These two base rhythms to connect our bars.
This can be expanded out to an arbitrary number of base rhythms until you never repeat the same rhythm. Drummers have pretty much mastered this unparallel flow technique:
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