chocolatebar/audio: move audio settings, add RT pipewire config

hosts/chocolatebar/audio.nix

@@ -0,0 +1,36 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}:
+with lib; let
+  psCfg = config.pub-solar;
+  xdg = config.home-manager.users."${psCfg.user.name}".xdg;
+in {
+  musnix = {
+    enable = true;
+    kernel.realtime = true;
+    soundcardPciId = "0d:00.4";
+  };
+
+  users.users."${psCfg.user.name}".extraGroups = ["realtime"];
+
+  home-manager.users."${psCfg.user.name}" = {
+    home.packages = with pkgs; [
+      lmms
+      audacity
+    ];
+  };
+
+  environment.etc = {
+    "pipewire/pipewire.conf.d/92-low-latency.conf".text = ''
+      context.properties = {
+        default.clock.rate = 48000
+        default.clock.quantum = 32
+        default.clock.min-quantum = 32
+        default.clock.max-quantum = 32
+      }
+    '';
+  };
+}

hosts/chocolatebar/configuration.nix

@@ -58,11 +58,6 @@ in {
     ];
   };
 
-  musnix = {
-    enable = true;
-    kernel.realtime = true;
-  };
-
   # For OpenProject development with https
   security.pki.certificates = [
     (builtins.readFile ./step-roots.pem)

hosts/chocolatebar/default.nix

@@ -4,6 +4,7 @@
     ./hardware-configuration.nix
 
     ./networking.nix
+    ./audio.nix
     ./virtualisation
     # ./factorio
   ];