Share 'Interpreting strumming for Murcia's Saldivar Codex 1730- need some help please'

Greetings all my first post but might as well jump into a good discussion. Okay, I've run into a good little dilemma here. I recently purchased the facsimile to the 1714 Saldivar Codex. Everything is pretty easy to understand in Murcia's notation thankfully except for strumming/rasgeado when it comes to patterns, rhythm, meter, and when to make the chord changes. Is anyone here familiar with thi…