How do I convert one sfm (book) file into multiple ones?

I’m trying to help an SIL team publish a Hymnal app, but it isn’t working quite as it should - the audio is not starting promptly when the play button is tapped, but with a delay of 5 to 10 seconds. Tap other things in this lag time and you’ll really confuse and crash the program. I’m thinking, after doing the troubleshooting I know to do, that it has to do with 147 audio files being linked to one sfm book file (by chapter numbers). In theory this should work, but it’s not. Do you know a way to divide this sfm file into 147 corresponding sfm ones? I’m thinking that having a one to one file relationship (sfm to mp3) would fix this problem, but I don’t know how to make these sfm files from the one.
Help is needed and would be greatly appreciated, thanks!

Hi Jon,
Looked for you on Skype. Send me your file. I’d like to have a look at it.

You cross posted. Good if you say you did that. My answer is under RAB.