In Sotto Voce was a secret side-project of Jo Casters & Herman Gillis from the band Poésie Noire, who started this secret side-project in 1988 as a response to a Belgian critic who found Poésie Noire "too poppy".

In Sotto Voce were supposedly two Yugoslavians named Ilya Dimitrijevic (Jo Casters) responsible for vocals/guitars and Boris Mikulic (really Herman Gillis) who handled keyboards and electronics. The two supposedly met each other at the University of Ljubljana where Ilya studied social sciences and Boris computer sciences. They started out by making music for theatre productions. After two years of doing this, they founded In Sotto Voce. They gave up studying and Ilya became a DJ in the "Draga Grad" new wave club where he came in contact with a lot of Belgian electronic stuff. They were influenced by Belgian acts as Front 242, Men 2nd, The Neon Judgement and Poésie Noire (what a coincidence!).

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