A freeware dual channel audio spectrum analyzer for Windows 95 which can provide either a scrolling time-frequency display or a spectrum analyzer scope display in real time for any sound source connected to your sound card. Version 4.2.0 replaces 4.1.2 and adds useful new features including spectrum averaging for noise reduction and more flexible scanning and recording capabilities.Spectrogram is ideal for any purpose related to sound spectrum analysis including analysis and identification of biological sounds, analysis and identification of human speech, analysis of musical performances, tuning of musical instruments, evaluation and calibration of home audio systems, and HAM radio audio reception and tuning.