improve voxtype post-processing config handling

home/modules/voxtype/default.nix

@@ -32,6 +32,10 @@ let
     '';
     meta.mainProgram = "voxtype-post-process";
   };
+
+  postProcessingConfig = pkgs.writeText "voxtype-post-processing.json" (
+    builtins.toJSON cfg.postProcessing.settings
+  );
 in
 {
   options.programs.voxtype = {
@@ -83,10 +87,14 @@ in
   };
 
   config = lib.mkIf cfg.postProcessing.enable {
-    xdg.configFile."voxtype/post-processing.json".text = builtins.toJSON cfg.postProcessing.settings;
+    xdg.configFile."voxtype/post-processing.json".source = postProcessingConfig;
     programs.voxtype.settings.output.post_process = {
       command = lib.getExe postProcess;
       timeout_ms = 5 * 60 * 1000; # 5 minutes
     };
+
+    systemd.user.services.voxtype.Service.X-Reload-If-Changed = [
+      postProcess
+    ];
   };
 }