FFMPEG Convert Wave to Mono Raw Audio for Radio Music Eurorack Module. Test playback with ffplay.

bulk_wave_to_raw.fish

# Bulk convert wave to mono raw audio for Radio Music Eurorack module
# Uses FFMPEG and Fish Shell
for file in *.wav; 
set basename (string match -r "(.*)\.[^\.]*\$" $file)[2]
ffmpeg -i $file -f s16le -acodec pcm_s16le -ac 1 $basename.raw; 
end;

loop_raw_file.sh

# play raw file with ffmpeg, loop it 4 times, and exit. Disable display.
ffplay -f s16le -ar 44.1k -ac 1 -nodisp -autoexit -loop 4 example.raw

# play raw file with ffmpeg, loop it 4 times, and exit. Include display.
ffplay -f s16le -ar 44.1k -ac 1 -autoexit -loop 4 example.raw

play_raw_files.fish

# Bulk play all raw files
# Uses ffplay (part of FFMPEG) and Fish Shell
# https://lynxbee.com/how-to-play-raw-pcm-voice-audio-files-using-ffplay-on-ubuntu/
# https://ffmpeg.org/ffplay.html
for file in *.raw; 
ffplay -f s16le -ar 44.1k -ac 1 -nodisp -autoexit $file;
end;

rename_to_8_3_format.bash

# https://stackoverflow.com/a/37826687
num=0; for i in *; do mv "$i" "$(printf '%04d' $num).${i#*.}"; ((num++)); done

wave_to_raw.sh

# https://github.com/TomWhitwell/RadioMusic/wiki/SD-Card%3A-Format-and-File-Structure
# https://stackoverflow.com/questions/4854513/can-ffmpeg-convert-audio-to-raw-pcm-if-so-how
# https://trac.ffmpeg.org/wiki/AudioChannelManipulation
ffmpeg -i Break1.wav -f s16le -acodec pcm_s16le -ac 1 Break1_mono.raw