I would like to point out that I've heard that "smørbrød" is a rather old-fashioned word. A more preferred term might be "brødskive" which means literally "bread slice." It can mean sandwich too, but either are correct and it's not unlikely to see either word on a menu. Hope that might be helpful.
Better than sandwich https://holmesfromthecrypt.files.wordpress.com/2012/09/sandwitch.jpeg
The r is pronounced, but the d depends on where in norway you are from.
Is sandwich a little bit like "butterbread" (as smør = butter and brød = bread)?
Completely right. We don't really hink about it as a "butterbread" though, and at least where i'm from we use sandwich quite often.
Ø is pronounced almost like the «i» in «first» or «sir». Try saying an «E», but holding your lips in an «O»-position.
isn't broschiver(not sure of the spelling but it sounds like this if i'm not mistaken) also sandwich?
brødskiver is used for sandwich but if you just translate it it means bread slice. smørbrød is a bit old fashioned so most people just use brødskive.
its pronounced exactly as the voice says if you listen to the thing