3 soundings of the "horn" any time in the spells duration of 1 round?
Is the duration a typo?
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HORN OF PURSUIT
School evocation [sonic]; Level bard 1, inquisitor 1, paladin 1,
ranger 1
Casting Time 1 standard action
Component S
Range personal
Effect 3 peals of a horn
Duration 1 round
Saving Throw none; Spell Resistance no
You create the sound of a large hunting horn, blowing up
to three notes as loud as a roaring dragon. These notes can
be heard up to 2 miles away in typical outdoor conditions.
You can make these sounds at any point during the spell’s
duration as a free action, and each sounding can be short or
long, allowing you to send very simple coded messages.