Apps similar to SPEAR include Sonic Visualiser, which is free and open source. Other options are AudioSculpt. Between them they cover Mac, Windows and Linux.
Sonic Visualiser is a free, open-source application for Windows, Linux, and Mac, designed to be the first program you reach for when want to study a music recording closely. It's designed for musicologists, archivists, signal-processing researchers, and anyone else looking...
AudioSculpt is a software for viewing, analysis and processing of sounds. AudioSculpt offers several graphical representations of the sound signal - Waveform, spectrum and sonagram - to obtain the desired changes and help the user to select optimal control parameters.
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