loop_gt — Looping constructions.
indx -- i-rate variable to count loop.
idecr -- value to decrement the loop.
imin -- minimum value of loop index.
kndx -- k-rate variable to count loop.
kdecr -- value to decrement the loop.
kmin -- minimum value of loop index.
The actions of loop_gt are equivalent to the code
indx = indx - idecr if (indx > imin) igoto label
or
kndx = kndx - kdecr if (kndx > kmin) kgoto label
More information on this opcode: http://www.csoundjournal.com/2006summer/controlFlow_part2.html , written by Steven Yi. And in the Floss Manuals: http://en.flossmanuals.net/csound/ch018_c-control-structures