Thanks to Sharon and all who contributed. As a Spanish-speaking person pretending to be a singer, I'll try to explain the pronunciation:

The phonetics in English would be GOO AN TAH NAH MEH RAH but Cubans pronounce a very soft initial "G", so you may feel confident to say ONE TAH NAH MER RAH

I do have a good MIDI and I can send it to anybody who may be interested. Somewhere in those threads I wrote the English phonetics for the lyrics.

Un abrazo - Andrés (from Buenos Aires)