SoX - mixing two audio tracks but looping/repeating only one I have two audio-files and want to mix them with **`SoX`** using the `-m, --combine mix` option. Both files have the same bpm, but not the same length, meaning I need to loop one file, but not the other. Does anyone on here know (if possible) how to do this? I managed to create a looped file with **`sox`** by using the `repeat` option, but I can not use this option only on one input file, somewhat like: sox -m repeat 4 one-bar.flac four-bar.flac outfile.flac also a **pipe** does not work: sox one-bar.flac repeat 4 | sox - -m four-bars.wav output.flac I get: sox FAIL sox: Not enough input filenames specified sox FAIL formats: can't determine type of `-'

got to use the **pipe** option `-p, --sox-pipe` otherwise the first command is not passing anything to `stdout` and the second command only gets one file for mixing:


sox FAIL sox: Not enough input filenames specified


Using a pipe with the `-p` option does the job:


sox one-bar.flac -p repeat 4 | sox - -m four-bars.wav output.flac