sox_ng is another Swiss Army Knife of sound processing utilities. It can convert audio files to other popular audio file types and also apply sound effects and filters during the conversion.
Ardour is an audio processing and editing application. It integrates broad hardware support, JACK and ALSA backends, flexible recording features, multi-channel nesting, import and exporting various file formats, comes with ready to use samples from freesound.org. It has a pretty editing UI, mixing, routing, monitoring, panning. Ardour allows non-destructive and non-linear editing, can be used for augmenting audio layers in video files even. And comes with many effect, input and output plugins. I
Support complete timeline editing functions, including move, crop, cut, thumbnail preview, scale and delete. Support more flexible and easily blueprint system. Blueprint is represented in the form of nodes, which can handle complex functions through nodes and flows. Support about 45+ built-in media filters and 70+ built-in media transitions. Support about 10 video and audio analysis tools. Support multiple audio and video codecs, including ProRes, H.264, H.265, VP9, etc. Support import and edit
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