Well, I did understand the title. But since it is about music this would mean mixing tracks into a room. Sorry, but I won't take it back, because you say I don't understand: I found the book rather superficial. You pay 24 Euro for not so many pages. Some pictures are 2-3 times on diffrent pages for no reason, but to have some more pages.
I would say nothing against the price, if the content was very good. But since you advertised here for free, it must be allowed to make my point as well. I think it's a good start, but not as I expected an insight on room acoustic that makes everything clear for a composer. Some good hints though.