Vortex shedding from shear layers may be driven by the resulting acoustical field. In order to achieve noise reduction, the feedback loop is broken down with the help of auxiliary secondary flows that are created by means of minor geometrical modifications. Experiments have been conducted on a flow through two close orifice plates in a cylindrical duct: they have brought forward the possibility of reaching stable paths of flow bifurcations where an important noise reduction is obtained in a large range of flow rates. By creating a suitable interaction between the main shear layer of the confined jet and thin auxiliary shear layers, noise reduction takes place in a range of 20–40 dB. The latest result is the following: due to the stability of the flow bifurcation path that can be reached, such a level of noise reduction is maintained in a large range of flow conditions. Moreover, by choosing an adequate path, noise reduction takes place for flow conditions where intense tones would be present if these flow conditions were to be reached through conventional means. It may be emphasized that such methods are costless, compared to some sophisticated active control methods.