Perhaps we'll use relm4 for audio?

applets/cosmic-applet-audio/src/main.rs

@@ -1,3 +1,13 @@
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
+#[macro_use]
+extern crate relm4;
+
+use once_cell::sync::Lazy;
+use tokio::runtime::Runtime;
+
+static RT: Lazy<Runtime> = Lazy::new(|| Runtime::new().expect("failed to build tokio runtime"));
+
 fn main() {
     println!("Hello, world!");
 }