concat_audio.sh- given a directory containing audio files of a single format, concatenates the audio to a single file using the same input format. NB: files are sorted by however bash defaults; generally the standard bash directory sorting, i.e. symbols > numerical > alphabetical. this was intended to combine dj mixes that have been split into files by track, and relies on track numbers in the file name to order correctly. usesffmpegextract_video_audio.sh- extracts audio from a video file usingffmpeg. outputs audio as a WAV file to the same dir as the source file using the same name