Digidesign MS091 DINR DINR, Digidesign's award-winning Intelligent Noise Reduction plug-in, effectively reduces unwanted noise — including tape hiss, guitar-amp buzz, and air conditioner rumble — for cleaner, more professional sounding audio. Since DINR analyzes and subtracts noise entirely within the digital realm, the results can be virtually free of side effects — such as distortion, dynamic modulation (pumping and breathing), and the undesired fluctuations in frequency response associated with conventional noise reduction systems.