I was looking for it myself and pulled down every font I could find. I ended up with 2500 fonts installed and none of them looked like the one Boss uses.
As a graphic designer that has taken many classes in Typography and has over 15,000 different fonts, I can honestly say that I have never seen it either, I believe it's proprietary to Boss.
Looks to me like he's been using the standard Arial Windows font. It doesn't look the Boss font at all.
I noticed that when I studied the "a" in the lettering. Is it just a point of curiousity or does someone want these fonts to maybe recondition the cosmetics of an older pedal?
Well, I'm a "multi-effects" kinda gal. I still love the compact pedals but playing professionally I need the flexibility of having every Boss pedal at my disposal without taking up half the stage let alone worrying about whether or not all my connections are going to work night after night.
Proud Boss GT-8 owner. and user of Boss products since 1976. oh, almost forgot..
if its Boss its ok in my books. im only biassed against multis because my first was a Zoom 509.
(lol) I daren't blame you on that one..but the topic was about Fonts.
But since this is an off topic section anyway, I guess there's no harm in showing a soundclip I did with the GT-8. I think Boss knows how to replicate their own pedals digitaly so I don't mind showing this even at the risk of making an a$$ ot of myself.
I used one guitar (a strat) no other instruments playing along with the drums (BOSS DR-5) recorded into a Boss BR1600CD (NO EFFECTS from anything but the GT-8).
It seems to be a variant on the font Bahaus. I've searched for it also and have never been able to find the exact font, but the Bauhaus family of fonts has some that are close.