This video demonstrates T-Voks: Singing and Speaking with the Theremin.
The video is sparse on details, but it uses sampled speech to modulate the spectra of the theremin. An earlier approach to the ‘singing theremin’ uses a vocal formant filter with the theremin.
For its 100th birthday, the Theremin has been gifted with speech. Performative singing synthesis met this early electronic instrument at NIME 2019.
Reference: T-Voks: Singing and Speaking with the Theremin Xiao Xiao, Grégoire Locqueville, Christophe d’Alessandro, Boris Doval Proceedings of The International Conference on New Interfaces for Musical Expression, NIME 2019, Porto Alegre, Brazil, 3-6 June 2019.
T-Voks (singing Theremin) : Xiao Xiao Piano: Boris Doval Flute : Benoît Fabre C-Voks (singing tablet) : Boris Doval, Christophe d’Alessandro, Grégoire Locqueville