diff --git a/src/logic/pulse.vala b/src/logic/pulse.vala
new file mode 100644
index 0000000..dbebb31
--- /dev/null
+++ b/src/logic/pulse.vala
@@ -0,0 +1,71 @@
+using PulseAudio;
+class CallPipe.Logic.Pulse : Object {
+    private GLibMainLoop p_loop = new GLibMainLoop ();
+    private Context context;
+    public string active_name { get; private set; }
+    construct {
+        context = new Context (p_loop.get_api (), Config.GETTEXT_PACKAGE);
+        context.set_state_callback (on_context_state_changed);
+        context.set_subscribe_callback (on_subscribe_callback);
+        this.context.connect (null, PulseAudio.Context.Flags.NOFAIL, null);
+    }
+    public void init () {
+    }
+
+    private void on_subscribe_callback (Context c, Context.SubscriptionEventType t, uint32 idx) {
+        get_default_device ();
+    }
+
+    private void on_context_state_changed (PulseAudio.Context ctx) {
+        switch (ctx.get_state ()) {
+        case Context.State.UNCONNECTED:
+            message ("PulseAudio state: UNCONNECTED");
+            break;
+        case Context.State.CONNECTING:
+            message ("PulseAudio state: CONNECTING");
+            break;
+        case Context.State.AUTHORIZING:
+            message ("PulseAudio state: AUTHORIZING");
+            break;
+        case Context.State.SETTING_NAME:
+            message ("PulseAudio state: SETTING_NAME");
+            break;
+        case Context.State.FAILED:
+            message ("PulseAudio state: FAILED");
+            break;
+        case Context.State.TERMINATED:
+            message ("PulseAudio state: TERMINATED");
+            break;
+
+        case Context.State.READY:
+            message ("PulseAudio state: READY");
+            context.subscribe (
+                               Context.SubscriptionMask.SINK
+                               | Context.SubscriptionMask.SOURCE
+                               | Context.SubscriptionMask.SINK_INPUT
+                               | Context.SubscriptionMask.SOURCE_OUTPUT);
+            get_default_device ();
+            break;
+        }
+    }
+
+    public void get_default_device () {
+        context.get_server_info ((ctx, info) => {
+            ctx.get_sink_info_by_name (info.default_sink_name, (ctx, i, eol) => {
+                if (eol == -1 || i == null) {
+                    return;
+                }
+                active_name = "%s:%s".printf (i.description, i.active_port->name);
+            });
+        });
+    }
+
+    private static Pulse _instance = null;
+    public static Pulse instance {
+        get {
+            if (_instance == null)
+                _instance = new Pulse ();
+            return _instance;
+        }
+    }
+}
diff --git a/src/main.vala b/src/main.vala
index 9625957..a5c0fcb 100644
--- a/src/main.vala
+++ b/src/main.vala
@@ -24,5 +24,6 @@ int main (string[] args) {
     Intl.textdomain (Config.GETTEXT_PACKAGE);
 
     var app = new Callpipe.Application ();
+    CallPipe.Logic.Pulse.instance.init ();
     return app.run (args);
 }
diff --git a/src/meson.build b/src/meson.build
index 247e36b..b6bac1c 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -2,12 +2,16 @@ callpipe_sources = [
   'main.vala',
   'application.vala',
   'window.vala',
+  'logic/pulse.vala',
 ]
 
 callpipe_deps = [
   config_dep,
   dependency('gtk4'),
   dependency('libadwaita-1', version: '>= 1.4'),
+  dependency('libpulse'),
+  dependency('libpulse-mainloop-glib'),
+  dependency('libpulse-simple'),
 ]
 
 blueprints = custom_target(
diff --git a/src/window.blp b/src/window.blp
index 1e40479..b60fcbe 100644
--- a/src/window.blp
+++ b/src/window.blp
@@ -18,12 +18,36 @@ template $CallpipeWindow: Adw.ApplicationWindow {
       }
     }
 
-    content: Label label {
-      label: _("Hello, World!");
+    content: ScrolledWindow {
+      Adw.Clamp {
+        margin-end: 12;
+        margin-start: 12;
+        valign: center;
+        halign: center;
 
-      styles [
-        "title-1",
-      ]
+        Box {
+          orientation: vertical;
+          spacing: 12;
+
+          Label {
+            label: _("Output:");
+
+            styles [
+              "title-1",
+            ]
+          }
+
+          Label label {
+            wrap: true;
+            wrap-mode: char;
+            label: _("FIXME?");
+
+            styles [
+              "title-2",
+            ]
+          }
+        }
+      }
     };
   };
 }
diff --git a/src/window.vala b/src/window.vala
index 5755177..944c7d3 100644
--- a/src/window.vala
+++ b/src/window.vala
@@ -25,5 +25,6 @@ public class Callpipe.Window : Adw.ApplicationWindow {
 
     public Window (Gtk.Application app) {
         Object (application: app);
+        CallPipe.Logic.Pulse.instance.bind_property ("active-name", label, "label", BindingFlags.DEFAULT);
     }
 }