Here's a minimal video showing basic functions.
There are a lot more features being added like being able to save pitch bends and controllers with the phrases.
Will go more into that later.
You have articulation maps so you can save articulations to notes in the phrases.
You can create realistic strum patterns using the virtual instrument keyswitches, these can be save to the library and fit to any chord progression.

Watch: Biab-RapidComposer4-2.mp4