diff --git a/nixos/ryu/apps/audio.nix b/nixos/ryu/apps/audio.nix
new file mode 100644
index 0000000..b5a1b31
--- /dev/null
+++ b/nixos/ryu/apps/audio.nix
@@ -0,0 +1,75 @@
+{
+  pkgs,
+  lib,
+  ...
+}: let
+  # Carla links against jack2's libjack; on PipeWire it must load pipewire-jack's
+  # drop-in instead (what `pw-jack` does via LD_LIBRARY_PATH). Wrap so it just works.
+  # JACK clients (Carla, Guitarix) are linked against jack2; on PipeWire they
+  # must load pipewire-jack's drop-in libjack (what `pw-jack` does). Without it
+  # they report "jack server not running". Wrap every bin to inject the lib.
+  withPwJack = pkg:
+    pkgs.symlinkJoin {
+      name = "${pkg.pname or pkg.name}-pw";
+      paths = [pkg];
+      nativeBuildInputs = [pkgs.makeWrapper];
+      postBuild = ''
+        for b in $out/bin/*; do
+          wrapProgram "$b" \
+            --prefix LD_LIBRARY_PATH : ${pkgs.pipewire.jack}/lib \
+            --set-default PIPEWIRE_LATENCY "256/48000"
+        done
+      '';
+    };
+
+  carla-pw = withPwJack pkgs.carla;
+  guitarix-pw = withPwJack pkgs.guitarix;
+
+  # mikeoliphant's NAM-LV2 is headless by design. Ratatouille is brummer10's
+  # GUI neural loader: loads .nam (and RTNeural) models plus a built-in dual IR
+  # cab loader, with an X11/cairo UI. Not yet in nixpkgs.
+  ratatouille = pkgs.stdenv.mkDerivation (finalAttrs: {
+    pname = "ratatouille-lv2";
+    version = "0.9.11";
+
+    src = pkgs.fetchFromGitHub {
+      owner = "brummer10";
+      repo = "Ratatouille.lv2";
+      tag = "v${finalAttrs.version}";
+      fetchSubmodules = true;
+      hash = "sha256-mig3yUGSNz1xuyz6ljKqJUjNqmEcsbXSH1vTxTGdOFk=";
+    };
+
+    nativeBuildInputs = [pkgs.pkg-config];
+    buildInputs = [pkgs.libsndfile pkgs.cairo pkgs.xorg.libX11 pkgs.lv2];
+
+    # Build uses -flto -fno-fat-lto-objects, so archives hold LTO bytecode;
+    # plain `ar` can't index them. gcc-ar loads the LTO plugin.
+    buildPhase = ''
+      runHook preBuild
+      make lv2 AR=gcc-ar
+      runHook postBuild
+    '';
+
+    installPhase = ''
+      runHook preInstall
+      make install INSTALL_DIR="$out/lib/lv2"
+      runHook postInstall
+    '';
+
+    meta = {
+      description = "Neural amp modeler + IR loader LV2 with GUI (NAM/RTNeural)";
+      homepage = "https://github.com/brummer10/Ratatouille.lv2";
+      license = lib.licenses.bsd0;
+      platforms = lib.platforms.linux;
+    };
+  });
+in {
+  environment.systemPackages = [
+    pkgs.neural-amp-modeler-lv2
+    pkgs.ir.lv2
+    guitarix-pw
+    ratatouille
+    carla-pw
+  ];
+}
diff --git a/nixos/ryu/apps/default.nix b/nixos/ryu/apps/default.nix
index 7ded199..6981c6b 100644
--- a/nixos/ryu/apps/default.nix
+++ b/nixos/ryu/apps/default.nix
@@ -17,5 +17,6 @@
     ./sgdboop.nix
     ./slo.nix
     ./umu.nix
+    ./audio.nix
   ];
 }
diff --git a/nixos/ryu/services/pipewire.nix b/nixos/ryu/services/pipewire.nix
index 74e7bd0..f6a98cb 100644
--- a/nixos/ryu/services/pipewire.nix
+++ b/nixos/ryu/services/pipewire.nix
@@ -5,6 +5,7 @@
     alsa.enable = true;
     alsa.support32Bit = true;
     pulse.enable = true;
+    jack.enable = true;
     extraConfig = {
       pipewire = {
         "10-clock-rate" = {