{
  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.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
  ];
}