KRK Audio Tools App is a suite of professional tools ideal for monitor tuning that can help you to get the best experience with your KRK monitors. It includes the following tools: - "Spectrum RTA" tool is used to measure and display the frequency spectrum of the input audio signal in realtime. - "Level Meter" tool is used for monitor level calibration. - "EQ Recommendation" tool is used to help determine which EQ presets may work best in your room. - "Monitor Align" tool is used to perfectly align the angle of your studio monitors. - "Delay" tool is used to time-align your monitors in a multi monitor system. - "Polarity" tool is used for verifying that monitors are wired correctly. Furthermore, it includes a signal generator that can generate sine waves, white noise and pink noise. The inline help contains instructions to use the tools correctly.