Three occasions come to mind immediately,
1) During “Hethay Habba’ – both when from every village the devotees go to Hethay temples at Beragani and Peddhuva as well as when the Hethay deity is taken to ‘Madi Halla -river’ for change into new dress once a year [and also whenever a hatti temple deity is taken on procession during habbas in hattis],
2) During weddings when the bride and groom are brought to the ‘Madhuvay Mane – wedding house,and the newly weds are taken to the temple and
3) On funerals when the widow is brought for ‘olay Kattodhu’ and the ‘akki eththuva ‘ procession starts from the ‘dhodda Mane’ to ‘saavu hanay ‘ where the corpse/body is kept before being taken for burial.
This loud ‘chanting /cry’ is made from the bottom of the stomach by a few leading the procession and repeated by the rest following them.
I have given the ‘live’ recordings of this unique chanting (recorded during a wedding [the band playing in the background] at Thambatty
at a funeral at Kundhey Ketchigatty)