diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..1e7a990
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "shared-modules"]
+	path = shared-modules
+	url = https://github.com/flathub/shared-modules.git
diff --git a/io.lmms.LMMS.json b/io.lmms.LMMS.json
index 641089d..9315b96 100644
--- a/io.lmms.LMMS.json
+++ b/io.lmms.LMMS.json
@@ -19,7 +19,9 @@
     /* Allow loading, saving files from the home directory (portals don’t work yet) */
     "--filesystem=home",
     /* Allow other instances to see lockfiles */
-    "--env=TMPDIR=/var/tmp"
+    "--env=TMPDIR=/var/tmp",
+    "--env=QT_AUTO_SCREEN_SCALE_FACTOR=1",
+    "--env=LD_LIBRARY_PATH=/app/lib:/app/lib/libgig"
   ],
   "cleanup": [
     "/include",
@@ -29,6 +31,7 @@
     "*.la"
   ],
   "modules": [
+    "shared-modules/SDL/SDL-1.2.15.json",
     {
       "name": "fftw3f",
       "config-opts": [
@@ -94,6 +97,50 @@
         }
       ]
     },
+    {
+      "name" : "pyqt5",
+      "config-opts" : [
+        "--disable-static",
+        "--enable-x11"
+      ],
+      "sources" : [
+        {
+          "type" : "archive",
+          "url" : "https://sourceforge.net/projects/pyqt/files/PyQt5/PyQt-5.11.3/PyQt5_gpl-5.11.3.zip",
+          "sha256" : "7cacf0712d76a702e0e2102a65f411fd72e7f64a851a47a72c03fbafbe447aae"
+        },
+        {
+          "type": "script",
+          "commands": [
+            "python3 configure.py --assume-shared --confirm-license --no-designer-plugin --no-qml-plugin --sysroot=/app --qsci-api --qsci-api-destdir=/app/qsci --sipdir=/app/share/sip --sip=/app/bin/sip --sip-incdir=/app/include QMAKE_CFLAGS_RELEASE='-I/usr/include/python3.7m/' QMAKE_CXXFLAGS_RELEASE='-I/usr/include/python3.7m/'"
+          ],
+          "dest-filename": "configure"
+        }
+      ],
+      "modules" : [
+        {
+          "name" : "sip",
+          "sources" : [
+            {
+              "type" : "archive",
+              "url" : "https://sourceforge.net/projects/pyqt/files/sip/sip-4.19.12/sip-4.19.12.tar.gz",
+              "sha256" : "24617fc31b983df075500ecac0e99d2fb48bf63ba82d4a17518659e571923822"
+            },
+            {
+              "type": "script",
+              "commands": [
+                "python3 configure.py --sip-module PyQt5.sip -b ${FLATPAK_DEST}/bin -d ${FLATPAK_DEST}/lib/python3.7/site-packages -e ${FLATPAK_DEST}/include -v ${FLATPAK_DEST}/share/sip --stubsdir=${FLATPAK_DEST}/lib/python3.7/site-packages"
+              ],
+              "dest-filename": "configure"
+            }
+                            ],
+          "cleanup" : [
+            "/bin",
+            "/include"
+          ]
+        }
+      ]
+    },
     {
       "name": "carla",
       "buildsystem": "simple",
@@ -109,6 +156,39 @@
         }
       ]
     },
+    {
+      "name": "stk",
+      "build-commands": [
+        "make -j $FLATPAK_BUILDER_N_JOBS -C src",
+        "make -j $FLATPAK_BUILDER_N_JOBS -C projects/effects libeffects",
+        "make -j $FLATPAK_BUILDER_N_JOBS -C projects/ragamatic libragamat",
+        "make -j $FLATPAK_BUILDER_N_JOBS -C projects/eguitar libeguitar"
+      ],
+      "post-install": [
+        "sh ./stk-install.sh"
+      ],
+      "sources": [
+        {
+          "type": "archive",
+          "url": "http://ccrma.stanford.edu/software/stk/release/stk-4.6.1.tar.gz",
+          "sha256": "e77ba3c80cdd93ca02c34098b9b7f918df3d648c87f1ed5d94fe854debd6d101"
+        },
+        {
+          "type": "file",
+          "path": "stk-install.sh"
+        }
+      ]
+    },
+    {
+      "name": "gig",
+      "sources": [
+        {
+          "type": "archive",
+          "url": "http://download.linuxsampler.org/packages/libgig-4.1.0.tar.bz2",
+          "sha256": "06a280278a323963042acdf13b092644cceb43ef367fcbb9ca7bbedff132bd0b"
+        }
+      ]
+    },
     {
       "name": "fltk",
       "config-opts": [
@@ -130,8 +210,7 @@
         "/share/man",
         "/lib/pkgconfig",
         "*.la"
-      ]
-    },
+    }
     {
       "name": "lmms",
       "buildsystem": "cmake-ninja",
diff --git a/shared-modules b/shared-modules
new file mode 160000
index 0000000..83318c8
--- /dev/null
+++ b/shared-modules
@@ -0,0 +1 @@
+Subproject commit 83318c84a6a561624579b8dce6091d04c1197073
diff --git a/stk-install.sh b/stk-install.sh
new file mode 100644
index 0000000..e2d9c9b
--- /dev/null
+++ b/stk-install.sh
@@ -0,0 +1,54 @@
+
+INCLUDE_DIR=/app/include
+DATA_DIR=/app/share
+LIB_DIR=/app/lib
+BIN_DIR=/app/bin
+
+
+
+
+install -Dm644 -t $INCLUDE_DIR/stk include/*
+install -Dm644 -t $LIB_DIR src/libstk.*
+install -Dm644 -t $DATA_DIR/stk/rawwaves rawwaves/*.raw
+
+#cp -pr projects/demo/tcl $DATA_DIR/stk/demo
+#cp -pr projects/demo/scores $DATA_DIR/stk/demo
+#cp -p projects/demo/demo $BIN_DIR/stk-demo
+#cp -p projects/demo/Md2Skini $BIN_DIR/Md2Skini
+#for f in Banded Drums Modal Physical Shakers StkDemo Voice ; do
+#  chmod +x projects/demo/$f
+#  sed -e 's,\./demo,$BIN_DIR/stk-demo,' -e '1i#! /bin/sh' \
+#    -i projects/demo/$f
+#  cp -p projects/demo/$f $DATA_DIR/stk/demo
+#done
+
+#cp -pr projects/examples/midifiles $DATA_DIR/stk/examples
+#cp -pr projects/examples/rawwaves $DATA_DIR/stk/examples
+#cp -pr projects/examples/scores $DATA_DIR/stk/examples
+#for f in sine sineosc foursine audioprobe midiprobe duplex play \
+#    record inetIn inetOut rtsine crtsine bethree controlbee \
+#    threebees playsmf grains ; do
+#  cp -p projects/examples/$f $BIN_DIR/stk-$f
+#  # absolute links, will be shortened later
+#  ln -s $BIN_DIR/stk-$f $DATA_DIR/stk/examples/$f
+#done
+
+install -Dm644 -t $DATA_DIR/stk/effects projects/effects/tcl
+install -Dm644 -t $BIN_DIR/stk-effects projects/effects/effects
+sed -e 's,\./effects,$BIN_DIR/stk-effects,' -e '1i#! /bin/sh' \
+    -i projects/effects/StkEffects
+install -Dm644 -t $DATA_DIR/stk/effects projects/effects/StkEffects
+
+install -Dm644 -t $DATA_DIR/stk/ragamatic projects/ragamatic/tcl
+install -Dm644 -t $DATA_DIR/stk/ragamatic projects/ragamatic/rawwaves
+install -Dm644 -t $BIN_DIR/stk-ragamat projects/ragamatic/ragamat
+sed -e 's,\./ragamat,$BIN_DIR/stk-ragamat,' -e '1i#! /bin/sh' \
+  -i projects/ragamatic/Raga
+install -Dm644 -t $DATA_DIR/stk/ragamatic projects/ragamatic/Raga
+
+install -Dm644 -t $DATA_DIR/stk/eguitar projects/eguitar/tcl
+install -Dm644 -t $DATA_DIR/stk/eguitar projects/eguitar/scores
+install -Dm644 -t $BIN_DIR/stk-eguitar projects/eguitar/eguitar
+sed -e 's,\./eguitar,$BIN_DIR/stk-eguitar,' -e '1i#! /bin/sh' \
+  -i projects/eguitar/ElectricGuitar
+install -Dm644 -t $DATA_DIR/stk/eguitar projects/eguitar/ElectricGuitar