The potential contestants had to try out to be on the show, then the ones selected would be presented on the show with two other contestants as well, for a total of three per program and 39 for the series. A jury, composed of all-rounders, selected by cognition, would secretly vote for their favorites during 10 weeks, and choose the 20 semi-finalists. The latter would then compete again in the Semi-Finals, separated in two groups of 10, for two weeks, and only 10 contestants would make it to the end.
The finals gala called, Festi-Voces (Festi-Voices), would be the last one of the season, composed of 13 weeks each, and it would be broadcast in a two hour special. The winner, would receive a trophy, a cash prize, and his or her inclusion as a regular in the following thirteen week season, as well as performing as guest stars in several television shows produced by the station. There were 5 final galas throughout the run of the show.
Voces en Función, was one of the first Puerto Rican television shows that was broadcasted via the Internet, and it also was the first television series taped on-location, at the Yaguez Theater, in Mayaguez, Puerto Rico, on a weekly basis.
The difference of Voces en Funcion from other singing contests, is that it was simultaneously a weekly variety show composed of various musical segments. Well known singers from the entertainment business were featured as guests stars in every show such as: Lucecita Benitez, Nydia Caro, Carmita Jimenez, Santos Colon, Marian Pabon, Danny Rivera, Son by Four, Lunna, Johnathan Dwayne, DLG, Rey Ruiz, Millie Corretjer, Chucho Avellanet, Jyve V, Lucy Fabery, and Charytin, among others.
The show also featured a pop ballet, directed by the Puerto Rican coreographer Marcelino Alcalá, called Ballet Voces, (Voices Ballet). Alcalá, also coreographed for the contestants, the opening numbers for the galas, as well as various musical productions for the host, and several guest stars.