His CD Dancing in the Light (CBC) of works by contemporary Canadian composer Christos Hatzis, featuring violist Rivka Golani, percussionist Beverly Johnson and oboist Suzanne Lemieux with Symphony Nova Scotia, was released to critical acclaim.
This followed a CD (RCA) of Mahler's Kindertotenlieder and Wagner's Wesendoncklieder with mezzo soprano Hanneli Rupert, the Cape Town Philharmonic Orchestra and the Cape Philharmonic Orchestra, and others with the Stuttgart Radio Symphony Orchestra with Peter Lukas Graf (flute) and oboist Lajos Lensces, with German Brass and the Stuttgart Chamber Orchestra.
Gueller also conducted the Cape Philharmonic Orchestra in an internationally released film documentary, Cosmic Africa.