It is aimed to describe dynamics of a whistling jet in a two hole configuration. The current configuration depicted in Fig. 1 displays tonal noise at low Reynolds numbers. Threshold of instability have been determined with aid of fully compressible linear stability theory and the evolution of the saturated frequency with a compressible weakly nonlinear stability method. The study at larger Reynolds numbers is carried out with an augmented compressibility model, a incompressible flow solver with impedance boundary conditions, whose underlying hypothesis are compacity of acoustic sources and monopolar radiation of sound. The augmented model has confirmed the existence of a region with bistability which was first determined in an experimental campaign.