Strong pressure pulsations within gas turbines may severely reduce the working range, exacerbate emissions, increase heat transfer to combustor walls, reduce combustion efficiency, and cause hardware/structure failures. Without successful attenuation of lean combustion instability, the concept of dry-low-emission combustion cannot be fully realized. A typical and practical control strategy is to introduce a secondary heat release rate perturbation using a high frequency fuel valve so as to nullify the positive feedback between pressure and heat release rate oscillations.