Can't comment for horn of war personally, but I've noticed the difference in all of my instruments as I upgraded them. IIRC, the only brass really you would be able to see the effect on is the lvl 18 dot. Depending on your level, the difference in the modifier might be such that its not enough for it to be visible yet, although that doesn't mean it is not working since that DoT doesn't do a whole lot of dmg to begin with.
I would imagine you should be able to see it regardless though. You could test it with the STR component of the 42 haste song as well.
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Jaxinor - 60 Virtuoso
Calibix - 41 Enchanter
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