pilon rhythm

i saw panga playing it, does anyone knows the origin and purpose.
The World of Percussions
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http://www.mycongaplace.com/forum/eng/viewtopic.php?f=13&t=4732
ABAKUA wrote:My version which Anga showed me is virtually the same, only that there is a left SLAP in place of the left TIP which is played before the right SLAP at the commencement of the rythem. And a left SLAP prior to opening the pattern on the Tumba. Basically replace the first and last left TIP with left SLAP.