LIVE SOUND KIT is a professional audio analysis tool designed for live sound engineers, DJs, and musicians. KEY FEATURES: - KEY FINDER — Real-time musical key detection using FFT chromagram analysis. Identifies the key of any live music instantly. - TEMPO — Auto BPM detection with beat tracking algorithm. Tap tempo and reverb time calculator included. - CALC — Essential audio engineering calculators. Distance-to-delay, frequency-to-wavelength, Q-factor, Ohm's law, and unit conversion. - SHOW — Live performance monitor. Real-time SPL meter in dB(A), feedback frequency detector, auto song recognition, key and BPM display — all on one screen. Built by a 20-year live sound engineer for real stage use.