The currently implemented Sousa sequence (sousa/linear-seq) only handles a linear display of media elements (including Sousa page objects). Other kinds of sequencing are possible such as the branching sequence.
The proposed sequence is technically a "branching sequence with merges", as shown in Learning Structures, Process Flow. In this structure, flow may branch based on user choices. Later, these branches may merge back into mainline or shared sequence lines.
At each node, one of the following are possible:
- The line terminates. User must exit.
- The line branches. Up to four branches seems reasonable.
- The line merges into another note. Sequencing continues.
The Branch with merge structure allows alternatives to be explore
