I am not too familiar with the NBv4 (But I had my fair share of trial and errors with the v3
).
I believe in v4 there is a Mute on the Go option (or whatever they call it), so you might have accidentally muted the saber when trying to change fonts. I would look at that first.
To more specifically answer you question, assuming no drastic changes to the v4 -- yes, you can have different sound levels for the different sound folders. It is set in the config.txt in each folder. If you didn't make any changes to the files on the SD card and the blade lights up, you probably muted it on accident.
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