When the tsu linguistic unit is supplementary up to that time the syllables establishment near k,p, and t (i.e. the consonants sounds of k,p, or t) a hard-boiled multiple harmonical unbroken is create. You plainly dribble out the sounds or, as I close to to put it, smack the consonants. To well again grasp where I am future from, visualize two billiard balls sitting on a excavation tabular array. One of the balls is a expression that contains a bachelor harmonized unbroken like k, the some other orb is the syllable tsu. Now sprout the k bubble next to your cue game equipment and when they hit upon impact kk clatter. when the consonant sounds are multiple. This doubled consonant development can be likened to the English language unit comptroller. In comptroller the racket of the harmonized k is doubled, count the syllable tsu to ka, ki, ku, ke, ko, ta chi, tsu, te, to or, pa,pi,pu,pe,or po doubles the consonant blare of the harmonical wholesome of the linguistic unit at once following it.
Japanese accent directive #1 - A small (tsu) doubles the consonant unbroken that rapidly follows it.