Better Documentation for DFPlayer?

At a friend's suggestion I picked up a DFPlayer for a project. I connected it to an Arduino and everything runs fine. Great.

But... my project will not use an Arduino (believe it or not, there are a lot of other microcontrollers on the market). I have managed to get my processor sending basic commands to the DFPlayer -- I can play music.

I really would like to see better documentation (that is not targeted to a single microcontroller) -- I think the entire community would appreciate it. For example, I don't have enough IO pins to use the busy line, so I'd like to use the serial connection to see if the module is finished playing. This seems possible based on the documentation, but there are no examples of using feedback.

Also, the naming and folder structure are a bit of a mystery and there are conflicting bits of information. Is the correct folder supposed to be called MP3, or can I have multiple folders 01, 02, 03, etc.? And if the latter is true (numbered folders), can I have the same file names in multiple folders?

I am working on a multi-lingual project and I would like the the prompt respective files to be named such that 0001.mp3 in folder 01 is the first prompt in English, and 0001.mp3 in folder 02 is the first prompt in Spanish. Is this possible, or do I have to put individual numbers on all files, regardless of folder location?

Thanks for your assistance.