diff --git a/pkgs/default.nix b/pkgs/default.nix
index 62b61c9..677507c 100644
--- a/pkgs/default.nix
+++ b/pkgs/default.nix
@@ -2,12 +2,15 @@
 
 final: prev:
 let
-  inherit (prev) callPackage system;
+  inherit (prev) callPackage system pkgsCross darwin;
   poetry2nix = callPackage inputs.poetry2nix { };
 in
 {
   ariang = callPackage ./ariang { };
   asterisk-sounds-de = callPackage ./asterisk-sounds-de { };
+  ksoloti = callPackage ./ksoloti {
+    gcc-arm-embedded = pkgsCross.arm-embedded.buildPackages.gcc;
+  };
   docker-machine-driver-hetzner = callPackage ./docker-machine-driver-hetzner {
     inherit (inputs.gomod2nix.legacyPackages.${system}) buildGoApplication;
   };
diff --git a/pkgs/ksoloti/default.nix b/pkgs/ksoloti/default.nix
new file mode 100644
index 0000000..54cdb30
--- /dev/null
+++ b/pkgs/ksoloti/default.nix
@@ -0,0 +1,110 @@
+{ lib
+, pkgs
+, stdenv
+, fetchFromGitHub
+, gnumake
+, gcc-arm-embedded
+, jdk
+, libfaketime
+, ant
+, makeWrapper
+, dfu-util
+}:
+
+stdenv.mkDerivation rec {
+  version = "1.1.0beta";
+  pname = "ksoloti";
+
+  src = fetchFromGitHub {
+    owner = "ksoloti";
+    repo = "ksoloti";
+    rev = version;
+    sha256 = "sha256-RRwar0X2gI0LyM/pNhnlLet06MzrG4z4lm3kCmzWwBc=";
+  };
+
+  buildInputs = [ jdk libfaketime ];
+
+  nativeBuildInputs = [
+    ant
+    gcc-arm-embedded
+    gnumake
+    makeWrapper
+  ];
+
+  propagatedBuildInputs = [
+    dfu-util
+    gcc-arm-embedded
+  ];
+
+  /*
+    # Hardcode dfu-util path
+    substituteInPlace "platform_linux/upload_fw_dfu.sh" \
+      --replace-fail "/bin/dfu-util" ""
+    substituteInPlace "platform_linux/upload_fw_dfu.sh" \
+    --replace-fail "./dfu-util" "${dfu-util-ksoloti}/bin/dfu-util"
+
+  */
+  patchPhase = ''
+    # Hardcode path to "make"
+    for f in "firmware/compile_firmware_linux.sh" \
+             "firmware/compile_patch_linux.sh"; do
+      substituteInPlace "$f" \
+        --replace "make" "${gnumake}/bin/make"
+    done
+
+    # Fix build version
+    substituteInPlace "build.xml" \
+      --replace-fail "(git missing)" "${version}"
+    # Remove build time
+    substituteInPlace "build.xml" \
+      --replace-fail "<tstamp>" ""
+    substituteInPlace "build.xml" \
+      --replace-fail \
+        '<format property="build.time" pattern="d MMM yyyy, HH:mm:ss"/>' \
+        '<property name="build.time" value=""/>'
+    substituteInPlace "build.xml" \
+      --replace-fail "</tstamp>" ""
+    substituteInPlace "build.xml" \
+      --replace-fail \
+       '{line.separator}</echo>' \
+       '{line.separator}</echo> <touch file="src/main/java/axoloti/Version.java" millis="0" />'
+  '';
+
+  buildPhase = ''
+    (
+      find . -exec touch -d '1970-01-01 00:00' {} \;
+      (cd platform_linux; PATH="${pkgs.gcc-arm-embedded}/bin:$PATH" sh compile_firmware.sh BOARD_AXOLOTI_CORE)
+      faketime "1970-01-01 00:00:00" ant -Dbuild.runtime=true
+    )
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin $out/share/ksoloti
+
+    cp -r doc firmware chibios platform_linux CMSIS *.txt $out/share/ksoloti/
+    install -vD dist/Ksoloti.jar $out/share/ksoloti/
+
+    patchShebangs $out/share/ksoloti/platform_linux/*.sh
+
+    rm $out/share/ksoloti/platform_linux/bin/dfu-util
+    ln -s ${dfu-util}/bin/dfu-util $out/share/ksoloti/platform_linux/bin/dfu-util
+
+    makeWrapper ${jdk}/bin/java $out/bin/ksoloti --add-flags "-Dksoloti_release=$out/share/ksoloti -Dksoloti_runtime=$out/share/ksoloti -jar $out/share/ksoloti/Ksoloti.jar" --prefix PATH : ${
+      lib.makeBinPath [
+        pkgs.gcc-arm-embedded
+      ]
+    }
+  '';
+
+  meta = with lib; {
+    homepage = "http://ksoloti.github.io";
+    description = ''
+      Sketching embedded digital audio algorithms.
+
+      To fix permissions of the Ksoloti USB device node, add a similar udev rule to <literal>services.udev.extraRules</literal>:
+      <literal>SUBSYSTEM=="usb", ATTR{idVendor}=="16c0", ATTR{idProduct}=="0442", OWNER="someuser", GROUP="somegroup"</literal>
+    '';
+    license = licenses.gpl3;
+    maintainers = with maintainers; [ ];
+  };
+}
diff --git a/pkgs/ksoloti/module.nix b/pkgs/ksoloti/module.nix
new file mode 100644
index 0000000..2948be5
--- /dev/null
+++ b/pkgs/ksoloti/module.nix
@@ -0,0 +1,5 @@
+{
+  services.udev.extraRules = ''
+    SUBSYSTEM=="usb", ATTR{idVendor}=="16c0", ATTR{idProduct}=="0442", OWNER="jalr", GROUP="users"
+  '';
+}
diff --git a/pkgs/modules.nix b/pkgs/modules.nix
index cdfda2f..25865fa 100644
--- a/pkgs/modules.nix
+++ b/pkgs/modules.nix
@@ -3,6 +3,7 @@
 {
   imports = [
     ./asterisk-sounds-de/module.nix
+    ./ksoloti/module.nix
     ./myintercom-doorbell/module.nix
     ./pretix-banktool/module.nix
   ];
diff --git a/users/jalr/modules/sound/default.nix b/users/jalr/modules/sound/default.nix
index 21f8976..37008dd 100644
--- a/users/jalr/modules/sound/default.nix
+++ b/users/jalr/modules/sound/default.nix
@@ -1,9 +1,10 @@
-{ nixosConfig, ... }:
+{ nixosConfig, pkgs, ... }:
 
 {
   imports = [
     ./audacity.nix
     ./easyeffects.nix
     ./pipewire.nix
+    ./ksoloti.nix
   ];
 }
diff --git a/users/jalr/modules/sound/ksoloti.nix b/users/jalr/modules/sound/ksoloti.nix
new file mode 100644
index 0000000..3528602
--- /dev/null
+++ b/users/jalr/modules/sound/ksoloti.nix
@@ -0,0 +1,7 @@
+{ nixosConfig, lib, pkgs, ... }:
+
+lib.mkIf nixosConfig.jalr.gui.enable {
+  home.packages = with pkgs; [
+    ksoloti
+  ];
+}