Perhaps we'll use relm4 for audio?

Cargo.lock

@@ -241,7 +241,8 @@ dependencies = [
  "gtk4",
  "libcosmic-widgets",
  "once_cell",
- "relm4-macros 0.4.2",
+ "pulsectl-rs",
+ "relm4",
  "tokio",
 ]
 
@@ -1013,6 +1014,33 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "libpulse-binding"
+version = "2.26.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "17be42160017e0ae993c03bfdab4ecb6f82ce3f8d515bd8da8fdf18d10703663"
+dependencies = [
+ "bitflags",
+ "libc",
+ "libpulse-sys",
+ "num-derive",
+ "num-traits",
+ "winapi",
+]
+
+[[package]]
+name = "libpulse-sys"
+version = "1.19.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "991e6bd0efe2a36e6534e136e7996925e4c1a8e35b7807fe533f2beffff27c30"
+dependencies = [
+ "libc",
+ "num-derive",
+ "num-traits",
+ "pkg-config",
+ "winapi",
+]
+
 [[package]]
 name = "lock_api"
 version = "0.4.6"
@@ -1123,6 +1151,17 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "num-derive"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "876a53fff98e03a936a674b29568b0e605f06b29372c2489ff4de23f1949743d"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "num-integer"
 version = "0.1.44"
@@ -1378,6 +1417,15 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "pulsectl-rs"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "06a988bceed1981b2c5fc4a3da0e4e073fdaff8e6bd022b089f54bc573dc3cfc"
+dependencies = [
+ "libpulse-binding",
+]
+
 [[package]]
 name = "quote"
 version = "1.0.15"
@@ -1456,6 +1504,7 @@ dependencies = [
  "gtk4",
  "log",
  "once_cell",
+ "relm4-macros 0.4.1",
  "tokio",
 ]