Typical frequency of the turbulent motions including the cascade (for the simulated sample M = 0.25 → 0.75), compared with the Brunt-Väisälä buoyancy frequency (black). The minimum turbulence frequency is at the injection scale, typically L ~ 600 kpc. For ω_turb<ω_BV (Froude < 1), g-waves tend to dominate driving entropy fluctuations, while sound waves drive stronger pressure perturbations in the opposite regime. Both types of perturbations are ∝M.