The spinoff Voctro Labs launches an app to help choir singers rehearse with the help of artificial voices


The program, called Cantamus, is able to read a score and automatically generate the voices of the entire choir to help performers practise

The UPF spinoff Voctro Labs has launched a new app, named Cantamus , a tool for choir singers to rehearse. The program uses machine learning algorithms that generate artificial voices based on the features of real voices. So, it is able to read a score and automatically generate the voices of the entire choir to help performers practise.

Thus, users can upload their own scores or select a piece from the catalogue, consisting of more than 50 popular works by composers such as Bach, Mozart, Haydn, Schubert, Mendelssohn, Brahms and Bruckner. In addition, the app can display the score while playing the music, record the singer’s voice and offer an automatic assessment of their tuning.

"We want to help define what choirs will be like in the near future; they may also be virtual and located anywhere in the world"

"One very important advantage of Cantamus is that the choirs can have their digital repertoire uploaded to the platform, and each singer can generate their own recordings to share with the conductor ", explains Voctro Labs director, Jordi Janer. In fact, the first version of the program offers a subscription for choirs, but "the next step will be to open it up to individual users, so that any singer can use it individually or in groups, creating choirs among friends or among people who share a liking for the same repertoire", he adds.

The company wishes to offer a product in keeping with the times: "we are doing more and more online activities, especially young people, and with Cantamus we want to help define what choirs will be like in the near future; they may also be virtual and located anywhere in the world", Janer reflects. Hence, the company aims to develop its technology to get users to be able to sing in groups and in real time, "like a virtual choir" , but from different locations.

From research to market

Cantamus technology emerged from a research project led by UPF researcher Emilia Gómez, from the Music Technology Research Group (MTG) , part of the UPF Department of Information and Communication Technologies. This group, from which the spinoff Voctro Labs was hatched, coordinated an R&D project of the European Commission called TROMPA , dedicated to developing solutions to make digital music resources more accessible.

As part of this project, Voctro Labs was commissioned to create synthetic voices in several languages and developed a prototype to evaluate the technology with performers. "When we saw that the singers’ response was very positive, we realized that there could be a market for our solution", says the company director.

Before launching its product, Voctro Labs has tested it with different choirs , such as Messies Participatiu , Cantoría , Coral Sant Medir and Igualada Gospel Choir , in Catalonia, Margaret’s Choir , from Canada, and Denmark’s Chorus Soranus.

About Voctro Labs

Voctro Labs is a company that emerged from UPF research that develops audio technologies based on artificial intelligence to create spoken or sung artificial voices taken from texts or scores.

The company, through the trademark Voiceful , offers its voice generation products to video game, music, virtual reality, film or mobile applications companies to integrate them in their products. Thus, one of the technologies they have developed is capable of making video game users talk using the voices of the characters. Now, with Cantamus, the spinoff is expanding its repertoire.


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