Here is a first video where Marieke van der Heyden (NL) plays Mattheson's Air on the new Theremincello, accompanied by Thijn Vermeulen (NL) on the piano.
The recording has been made during the last rehearsal before a public Theremin, Theremincello and Piano concert on May 12th, 2013 during the international Cello Festival in Dordrecht (NL).