The IRC modes provide intelligent release control (the release time is automatically varied depending on the audio material). You may find that at sampling rates greater than 48 kHz you are unable to use IRC III mode in real-time.

The IRC III mode is very CPU-intensive, and produces a high latency, especially at higher sampling rates.

IRC IIIĪllows for the most aggressive limiting by using an advanced psychoacoustic model to intelligently determine the speed of limiting that can be done to the incoming signal, before producing distortion that is detectable to the human ear. Similar to IRC I, but optimized to preserve transients even more, so they sound sharper and clearer in the output signal, even when aggressive limiting is taking place. It does this by analyzing the source material and applying limiting in a psychoacoustically pleasing manner, reacting quickly to transients (to prevent pumping) and reacting more slowly to steady bass tones (to prevent distortion). Provides intelligent digital loudness maximization of the signal. Provides the intelligent loudness maximization of IRC I with lower latency. The Maximizer includes the following Intelligent Release Control (IRC) modes: The Maximizer applies to the entire bandwidth of the mix it is not a multiband effect. Ozone’s acclaimed IRC (Intelligent Release Control) technology lets you boost the overall level of your mixes without sacrificing dynamics and clarity.

Izotope 8 advanced maximizer