{ pkgs, config, ... }:
{
  # PipeWire with JACK support
  services.pipewire = {
    enable = true;
    alsa.enable = true;
    pulse.enable = true;
    jack.enable = true;
    wireplumber.enable = true;

    # Low-latency: ~5ms at 48kHz
    extraConfig.pipewire."92-low-latency" = {
      "context.properties" = {
        "default.clock.rate"        = 48000;
        "default.clock.allowed-rates" = [ 44100 48000 88200 96000 176400 192000 ];
        "default.clock.quantum"     = 128;
        "default.clock.min-quantum" = 64;
        "default.clock.max-quantum" = 512;
      };
    };

    extraConfig.pipewire-pulse."92-low-latency" = {
      "pulse.properties" = {
        "pulse.min.req"     = "64/48000";
        "pulse.default.req" = "64/48000";
        "pulse.max.req"     = "128/48000";
      };
    };
  };

  # Real-time scheduling
  security.rtkit.enable = true;
  security.pam.loginLimits = [
    { domain = "@audio"; item = "memlock"; type = "-"; value = "unlimited"; }
    { domain = "@audio"; item = "rtprio";  type = "-"; value = "95"; }
  ];

  users.users.fredrikr.extraGroups = [ "audio" ]; # <-- change yourname

  # Zen kernel = better real-time perf
  boot.kernelPackages = pkgs.linuxPackages_zen;
  boot.kernelParams = [
    "threadirqs"
    "usbcore.autosuspend=-1"  # prevent USB interface from sleeping
  ];
  powerManagement.cpuFreqGovernor = "performance";

  environment.systemPackages = with pkgs; [
    qpwgraph          # visual patchbay - connect guitar in → amp → out
    pavucontrol       # set Scarlett to "Pro Audio" profile
    guitarix          # amp sim, use instead of Ableton
    lsp-plugins       # EQ, compressor, etc.
    alsa-scarlett-gui # Scarlett hardware mixer
  ];
}