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FFilter is an open-source, cross-platform application to implement spectral filtering on audio files. The application is written in Python using the NumPy signal processing library's FFT and inverse-FFT functionality. File IO for WAV files is provided by Python's standard library. Example usage: python FFilter.py -f audio.wav -o output.wav -hp 100 -lp 2000 -n 1024 Type use FFilter.py --help for a full breakdown of command line arguments.