diff --git a/src/generate_images.py b/src/generate_images.py
index e9c87f6..5a18ce6 100644
--- a/src/generate_images.py
+++ b/src/generate_images.py
@@ -59,6 +59,18 @@ def crop_image(file):
     img.crop((0, min_non_white, img.width-1, max_non_white)).save(file)
     return img.width, max_non_white - min_non_white
 
+def generate_concat(images, dest):
+    if os.path.exists(dest):
+        if input("Overwrite {dest} ? [y/N] ").lower() != "y":
+            return
+
+    content = "ffconcat version 1.0"
+    for img in images:
+        content += "\nfile {img}\nduration 8"
+
+    with open(dest, "w") as f:
+        f.write(content)
+
 
 def adjust_images(images):
     width, height = -1, -1
@@ -90,8 +102,17 @@ if __name__ == "__main__":
         sys.exit(1)
 
     generate_images(sys.argv[1], sys.argv[2])
+    img_dir = os.path.dirname(sys.argv[2])
+    images = [
+        img for img in os.listdir(img_dir) if img.startswith(os.path.basename(sys.argv[2])) and img.endswith(".png") and "short" not in img
+    ]
+    short_images = [
+        img for img in os.listdir(img_dir) if img.startswith(os.path.basename(sys.argv[2])) and img.endswith(".png") and "short" in img
+    ]
     adjust_images([
-        img for img in os.listdir(os.path.dirname(sys.argv[2])) if
-        img.startswith(os.path.basename(sys.argv[2])) and img.endswith(".png") and "short" not in img
+        os.path.join(img_dir, img) for img in images
     ])
+    generate_concat(images, os.path.join(img_dir, "concat.txt"))
+    generate_concat(short_images, os.path.join(img_dir, "concat_short.txt"))
+    logger.log("Generated concat*.txt files. Please edit them")
 
diff --git a/src/modules/mscz.py b/src/modules/mscz.py
index 8f4dcb1..63e070e 100644
--- a/src/modules/mscz.py
+++ b/src/modules/mscz.py
@@ -2,6 +2,7 @@ from xml.etree import ElementTree
 import functools
 import zipfile
 import shutil
+import json
 
 
 """
@@ -16,9 +17,16 @@ class Patches:
 
 patches = Patches()
 
-def register_patch(file_ext):
+def register_patch(ext=None, filename=None):
+    if ext is None and filename is None:
+        raise ValueError("You must specify at least one of the two parameters")
+
+
     def inner_wrapper(view):
-        patches._data[view.__name__] = (view, file_ext)
+        if ext is not None:
+            patches._data[view.__name__] = (view, ext, False)
+        if filename is not None:
+            patches._data[view.__name__] = (view, filename, True)
 
         @functools.wraps(view)
         def wrapped_view(**kwargs):
@@ -28,7 +36,7 @@ def register_patch(file_ext):
     return inner_wrapper
 
 
-@register_patch("mscx")
+@register_patch(ext="mscx")
 def create_pagebreaks(data):
     """
     Replaces all manual linebreaks by pagebreaks in a .mscx file (xml)
@@ -53,7 +61,7 @@ def create_pagebreaks(data):
 
     return ElementTree.tostring(root)
 
-@register_patch("mss")
+@register_patch(ext="mss")
 def remove_footer(data):
     """
     Disable page footer in .mss (xml)
@@ -66,6 +74,15 @@ def remove_footer(data):
 
     return ElementTree.tostring(root)
 
+@register_patch(filename="audiosettings.json")
+def better_soundfont(data):
+    data = json.loads(data)
+
+    for track in data["tracks"]:
+        pass
+
+    return json.dump(data)
+
 
 """
 The "main" apply function
@@ -88,24 +105,32 @@ def apply(source, dest, patches):
     Apply functions to patch files inside a mscz
     - source : source file
     - dest : destination file, must differ
-    - patches : list of (function, file extension)
+    - patches : list of (function, file extension or filename, is_filename)
     """
     patches_by_ext = {}
-    for func, ext in patches:
-        if ext not in patches_by_ext:
-            patches_by_ext[ext] = []
+    patches_by_filename = {}
+    for func, arg, is_filename in patches:
+        if arg not in patches_by_ext:
+            patches_by_ext[arg] = []
+        patches_by_ext[arg].append(func)
 
-        patches_by_ext[ext].append(func)
+        if arg not in patches_by_filename:
+            patches_by_filename[arg] = []
+        patches_by_filename[arg].append(func)
 
     shutil.copy(source, dest)
     with zipfile.ZipFile(source) as inzip, zipfile.ZipFile(dest, "w") as outzip:
         for inzipinfo in inzip.infolist():
             with inzip.open(inzipinfo) as infile:
                 ext = inzipinfo.filename.split(".")[-1]
+
+                data = infile.read()
                 if ext in patches_by_ext:
-                    data = infile.read()
                     for func in patches_by_ext[ext]:
                         data = func(data)
-                    outzip.writestr(inzipinfo.filename, data)
-                else:
-                    outzip.writestr(inzipinfo.filename, infile.read())
\ No newline at end of file
+                
+                if inzipinfo.filename in patches_by_filename:
+                    for func in patches_by_filename[inzipinfo.filename]:
+                        data = func(data)
+                
+                outzip.writestr(inzipinfo.filename, data)
\ No newline at end of file