Gravitational wave researchers working on the world’s most sensitive scientific instruments have found a way to tune their detectors using a process akin to the pitch-correction used in music production. Scientists at the international LIGO, Virgo and KAGRA (LVK) gravitational wave observatory collaboration have employed the technique, which they call astrophysical calibration, to use gravitational-wave signals to measure the response of their incredibly sensitive instruments. It enables them to ensure that they can clearly ‘hear’ the sounds of colossal cosmic events like the collision of black holes, even when one gravitational wave detector is slightly out of tune. This is crucial to accurately interpret the signals and find their source location. By combining signals from other detectors with precise predictions from the laws of gravity, researchers can identify and account for subtle distortions in the data. The process is similar to how music‑production software such as Auto-Tune can correct a singer’s errant pitch to meet the intended note in a melody. The Autotune problem in gravitational waves. (CREDIT: University of Glasgow) In a new paper …