In this paper we present the design and development of the Transhuman Ansambl, a novel interactive singing-voice interface which senses its environment and responds to vocal input with vocalisations using human voice. Designed for live performance with a human performer and as a standalone sound installation, the ansambl consists of sixteen bespoke virtual singers arranged in a circle. When performing live, the virtual singers listen to the human performer and respond to their singing by reading pitch, intonation and volume cues. In a standalone sound installation mode, singers use ultrasonic distance sensors to sense audience presence. Developed as part of the 1st author's practice-based PhD and artistic practice as a live performer, this work employs the singing-voice to explore voice interactions in HCI beyond language, and innovative ways of live performing. How is technology supporting the effect of intimacy produced through voice? Does the act of surrounding the audience with responsive virtual singers challenge the traditional roles of performer-listener? To answer these questions, we draw upon the 1st author's experience with the system, and the interdisciplinary field of voice studies that consider the voice as the sound medium independent of language, capable of enacting a reciprocal connection between bodies.