Convert wave files to 44100 kHz with SoX (useful for 44100 kHz only samplers like the Octatrack)

convert.bash

#!/usr/bin/env bash

# Note: requires bash 4.4+ for `readarray -d`
# Note: requires SoX - http://sox.sourceforge.net/

set -e

back="${PWD}"

function convert_samples_in_dir {
    local outdir="../${1}_44100"
    mkdir -p "$outdir"

    for file in *.wav
    do
        sox "$file" -r 44100 -V3 "$outdir/$file"
    done
}

readarray -d '' array < <(find . -type d -print0)
unset "array[0]"

for dir in "${array[@]}"
do
    cd "$dir"
    convert_samples_in_dir "${PWD##*/}"
    cd "$back"
done