diff --git a/src/images_to_video.sh b/src/images_to_video.sh
old mode 100644
new mode 100755
index c0f4568..f31b6aa
--- a/src/images_to_video.sh
+++ b/src/images_to_video.sh
@@ -15,5 +15,8 @@ echo $WIDTH x $HEIGHT
 # Center all the images and pad them to the larger width and height
 # Set the border color to the dominant color of the image
 for f in $FILES; do
-    convert $f -gravity center -background none -extent ${WIDTH}x${HEIGHT} -bordercolor $(convert $f -format "%[pixel:p{0,0}]" info:) -border 0x0 $f
+    BORDER_COLOR=$(convert $f -format "%[pixel:p{0,0}]" info:)
+    echo "Border color: $BORDER_COLOR"
+    # BORDER_COLOR="srgb(255,255,255)"
+    convert $f -gravity center -background none -extent ${WIDTH}x${HEIGHT} -bordercolor $BORDER_COLOR -border 0x0 $f
 done
\ No newline at end of file
diff --git a/src/mscz_to_mp3.py b/src/mscz_to_mp3.py
index df6ef7f..13a88a3 100644
--- a/src/mscz_to_mp3.py
+++ b/src/mscz_to_mp3.py
@@ -74,9 +74,7 @@ def create_audios(files, dest="out"):
         print(f"Converted {basename(el)}.mp3")
 
 
-def __main__():
-    SCORE=sys.argv[1]
-    OUT=sys.argv[2]
+def __main__(SCORE, OUT):
     os.makedirs(OUT, exist_ok=True)
 
     if SCORE.split(".")[-1] == "mscz":
@@ -104,4 +102,8 @@ def __main__():
 
 
 if __name__ == "__main__":
-    __main__()
\ No newline at end of file
+    if len(sys.argv) < 3:
+        print(f"Usage: {sys.argv[0]} <file.mscz> <out/>")
+        exit(1)
+
+    __main__(sys.argv[1], sys.argv[2])
\ No newline at end of file
diff --git a/src/set_audio.sh b/src/set_audio.sh
index 2e384c6..9714ef2 100755
--- a/src/set_audio.sh
+++ b/src/set_audio.sh
@@ -11,6 +11,7 @@ IN=$1
 AUDIOS=out
 OUT=videos
 mkdir -p "$OUT"
+BASE_NAME="instrument_"
 
 add_audio () {
     ffmpeg -y \
@@ -22,7 +23,7 @@ add_audio () {
         $3
 }
 
-add_audio "$IN" "$AUDIOS/instrument_1.mp3" "$OUT/soprane.mkv"
-add_audio "$IN" "$AUDIOS/instrument_2.mp3" "$OUT/alti.mkv"
-add_audio "$IN" "$AUDIOS/instrument_3.mp3" "$OUT/tenor.mkv"
-add_audio "$IN" "$AUDIOS/instrument_4.mp3" "$OUT/basse.mkv"
+add_audio "$IN" "$AUDIOS/${BASE_NAME}1.mp3" "$OUT/soprane.mkv"
+add_audio "$IN" "$AUDIOS/${BASE_NAME}2.mp3" "$OUT/alti.mkv"
+add_audio "$IN" "$AUDIOS/${BASE_NAME}3.mp3" "$OUT/tenor.mkv"
+add_audio "$IN" "$AUDIOS/${BASE_NAME}4.mp3" "$OUT/basse.mkv"
diff --git a/src/superpose_audios.sh b/src/superpose_audios.sh
new file mode 100755
index 0000000..ec27217
--- /dev/null
+++ b/src/superpose_audios.sh
@@ -0,0 +1,29 @@
+#!/bin/bash
+
+AUDIOS=out
+BASE_NAME="instrument_"
+BASE_OUT_NAME="combined_"
+VOLUME_2="0.1"
+
+
+combine () {
+    ffmpeg -y \
+        -i $1 \
+        -i $2 \
+        -filter_complex \
+        "[0:a]volume=1.0[a1];[1:a]volume=${VOLUME_2}[a2];[a1][a2]amix=inputs=2:duration=first" \
+        $3
+}
+
+input_file () {
+    echo "${AUDIOS}/${BASE_NAME}$1.mp3"
+}
+
+output_file () {
+    echo "${AUDIOS}/${BASE_OUT_NAME}$1.mp3"
+}
+
+combine "$(input_file 1)" "$(input_file 3)" "$(output_file 1)"
+combine "$(input_file 2)" "$(input_file 3)" "$(output_file 2)"
+combine "$(input_file 3)" "$(input_file 1)" "$(output_file 3)"
+combine "$(input_file 4)" "$(input_file 1)" "$(output_file 4)"