paste interval in pro 9

ok we're talking drum track creation here.
 
copy and paste in the piano roll window...
 
when the paste window comes up, in the second column, there is a spin box marked interval and I can't find any documentation on what that means or link repetitions
can someone help?
 
also when I paste more than one repetition, in the spin box in the first column, the paste winds up with the first note at the first tick of the measure after the measure I do the insert in even if the first drum beat starts at 40 ticks in the section I copied. If that make sense.
zz