diff --git a/Cargo.toml b/Cargo.toml
index bfed3a539..149ead04c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,6 +22,7 @@ toml = "^0.4.2"
 serde_derive = "^1.0.9"
 serde = "^1.0.9"
 xdg = "*"
+which = "*"
 
 [dependencies.gtk]
 git = "https://github.com/gtk-rs/gtk.git"
diff --git a/src/main.rs b/src/main.rs
index c3d39b73a..c9812daec 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -26,6 +26,7 @@ extern crate gobject_sys;
 extern crate gtk;
 extern crate gtk_sys;
 extern crate libc;
+extern crate which;
 extern crate xdg;
 
 use std::rc::Rc;
@@ -65,10 +66,10 @@ fn main() {
     let apps = Rc::new(AppS::new());
 
     let mut prefs = prefs::Prefs::new().unwrap();
-    println!("Channel: {:?}", prefs.to_str());
+    println!("Channel: {}", prefs.to_str());
     prefs.store_config();
 
-    // println!("Channel: {:?}", prefs.to_str());
+    println!("Control_cmd: {:?}", prefs.get_avail_vol_control_cmd());
 
     ui_entry::init(apps);
 
diff --git a/src/prefs.rs b/src/prefs.rs
index 13f25ec58..0638e5b33 100644
--- a/src/prefs.rs
+++ b/src/prefs.rs
@@ -1,8 +1,12 @@
 use errors::*;
-use toml;
-use xdg;
+use std::fmt::Display;
+use std::fmt::Formatter;
 use std::fs::File;
 use std::io::prelude::*;
+use std;
+use toml;
+use which;
+use xdg;
 
 
 
@@ -28,17 +32,6 @@ impl Default for MiddleClickAction {
 }
 
 
-#[derive(Deserialize, Debug, Serialize, Default)]
-#[serde(default)]
-pub struct Prefs {
-    pub device_prefs: DevicePrefs,
-    pub view_prefs: ViewPrefs,
-    pub behavior_prefs: BehaviorPrefs,
-    pub notify_prefs: NotifyPrefs,
-    // TODO: HotKeys?
-}
-
-
 #[derive(Deserialize, Debug, Serialize)]
 #[serde(default)]
 pub struct DevicePrefs {
@@ -101,7 +94,7 @@ impl Default for VolColor {
 #[derive(Deserialize, Debug, Serialize)]
 #[serde(default)]
 pub struct BehaviorPrefs {
-    vol_control_cmd: Option<String>,
+    pub vol_control_cmd: Option<String>,
     pub vol_scroll_step: f64,
     pub middle_click_action: MiddleClickAction,
     // TODO: fine scroll step?
@@ -142,8 +135,15 @@ impl Default for NotifyPrefs {
 }
 
 
-
-
+#[derive(Deserialize, Debug, Serialize, Default)]
+#[serde(default)]
+pub struct Prefs {
+    pub device_prefs: DevicePrefs,
+    pub view_prefs: ViewPrefs,
+    pub behavior_prefs: BehaviorPrefs,
+    pub notify_prefs: NotifyPrefs,
+    // TODO: HotKeys?
+}
 
 impl Prefs {
     pub fn new() -> Result<Prefs> {
@@ -201,12 +201,32 @@ impl Prefs {
     }
 
 
-    // TODO: implement
-    pub fn vol_control_cmd() -> String {
-        return String::from("");
+    pub fn get_avail_vol_control_cmd(&self) -> Option<String> {
+        match self.behavior_prefs.vol_control_cmd {
+            Some(ref c) => return Some(c.clone()),
+            None => {
+                for command in VOL_CONTROL_COMMANDS.iter() {
+                    if which::which(command).is_ok() {
+                        return Some(String::from(*command));
+                    }
+                }
+            }
+        }
+
+        return None;
     }
 }
 
+impl Display for Prefs {
+    fn fmt(&self,
+           f: &mut Formatter)
+           -> std::result::Result<(), std::fmt::Error> {
+        let s = self.to_str();
+        return write!(f, "{}", s);
+    }
+}
+
+
 fn get_xdg_dirs() -> xdg::BaseDirectories {
     return xdg::BaseDirectories::with_prefix("pnmixer-rs").unwrap();
 }