Convert all files as duo mono files
create a folder in which you want to convert the stereo clips to mono.
#!/bin/bash
for f in .wav; do ffmpeg -i "$f" \
-filter_complex "[0:a]channelsplit=channel_layout=stereo[L][R]" \
-map "[L]" "${f%.}_EXTRACTED_Lt.wav" \
-map "[R]" "${f%.*}_EXTRACTED_Rt.wav"; done
