Diviner slit gong probably Zombo
Often illness and unexplained deaths are believed to be caused by offended ancestors or neglected deities.
The sorcerer identifies the cause of the problem and prescribes a remedy.
The wooden - slit drum is the symbol of the sorcerer but is also used as the sorcerer´s seat and as a container in which to prepare medicines.
References:
Devisch René :The Therapist and the Source of Healing among the Yaka of Zaire. 1990
Beek, Walter E. A. van, and Philip M. Peek. (2013) - Reviewing Reality: Dynamics of African Divination.
de Beir, L. - Religion et magie des Bayaka. 1975
Michel Plancquaert - Les Sociétés Secrètes chez les Bayaka, Louvain, Imprimerie J. Kuyl-Otto, 1930
Michel Plancquaert - Les Jaga et les Bayaka du Kwango. 1932
Bourgeois, Arthur, P. - Art of the Yaka and Suku, Meudon, Alain and Françoise Chaffin, 1984
Bourgeois, Arthur, P. - Kakungu among the Yaka and Suku. African Arts 14
Pemberton, John - Insight and Artistry in African Divination.