perfect-record-md.sh

#!/usr/bin/env bash
set -eu

SKIP_TRACKS=$((${SKIP_TRACKS:=0} + 1))

while ALBUM="$1" && [ ! -z "$ALBUM" ]; do
  find "$ALBUM" -iname "*.flac" \
    | sed -e 's:\(.*/\)\([^/]*\):\2 \1\2:' \
    | sort -n \
    | sed -e 's:[^/]* ::' \
    | tail -n +$SKIP_TRACKS \
    | tr '\n' '\0' \
    | xargs -0 -n 1 bash -c '\
      echo "$0" > "$HOME/.recording" \
      && (sox -v 0 "$0" -t sox - synth sine mix 1 gain -36 \
        | sox --replay-gain off -m "$0" -t sox - -t coreaudio "NFJ USB Audio" norm -1 ) \
      && sleep 2'
  shift
done

rm $HOME/.recording