[cybmole]

I am seeing a pattern but I cannot pin it down to a set of logical rules.

the user guide says that when you open a new book, the current default ( i.e. the position you last places the sliders in,) is applied . I think we both buy into that statement.
so imagine a device with just one book. we open that & establish a future default.( but maybe we have to move a slider to force that defalt to register ? )

the next puzzle is what happens when we then add another book to the device ( via sideload or via purchase) & then 1. open another new book & 2. change the sliders: we think that change is now recorded at book level.

So what do we expect to see if we now open the 1st book, does what we see depend on whether we forced a "save" for the 1st book.

then, exactly what action forces a save, is it moving a slider while the book is open ? the user guide offers no insight, & its not like a PC where you can look to see if the disc write light flashes on.

The logic is also complicated by apparent differences between kepub & epub, which is what got me into re-thinking what I thought I'd previously puzzled out.

What I want is for any book that I've already opened to remember it's settings, ( if I have to nudge a slider to left & then to right to "force" that so be it, but i don't want that book to be affected to any tweaks I make within other books )
I want a new book to open with a similar layout to what I've using for other books. If it intents to default to whatever last think I did with the sliders then again so be it. but It does not appear to be documented anywhere.

I'd just like to fully understand the firmware's logic, then I can train myself to use an appropriate workflow with no surprises.

once I can get the aura HD behaviour sussed, I can attempt the same for the Kobo android app , which I think has simpler rules - the app treats everything as kepub, it has a slider for font size (which I think it applies globally), and it has a choice of 3 fonts - publisher default, droid serif, droid sans serif - which I again think it applies globally.

So I don't think the android app saves any per-book settings,

I read that the aura HD stores epubs as single files & kepubs within a single database, so maybe it has two locations for storing slider settings i.e. it stores one set per format ?