It plays the arpeggio pattern (based on the currently held notes, the more notes that are held, the longer is the pattern. If a single note is held, the pattern itself is just 1 note) first in the current octave the notes are in, then if the octave range is positive, it jumps to the next octave up and plays the pattern again, until it reaches the limit, and starts at the octave the notes are in again. If negative, then pretty much the same, but goes down an octave each time.
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Got it. My bad, forgot exactly how an arpeggiator works. Working fine!
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Cheers! 
The Arp pipe can be nicely combined with harmonizer and/or sustain pipes. 
Yes, I noticed. Nice tool!
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