diff --git a/bin/mpg321-dummy b/bin/mpg321-dummy
old mode 100755
new mode 100644
index 050767f..84caed2
--- a/bin/mpg321-dummy
+++ b/bin/mpg321-dummy
@@ -1,5 +1,10 @@
-#!/bin/bash
+var i = 1;
 
-while read line ; do
-    echo "running $line"
-done
+setInterval(function() {
+    i += 1;
+    process.stderr.write(`@F ${i} 2 3 4\n`);
+}, 100);
+
+process.stdin.on('data', function(data) {
+    process.stdout.write(`GOT MESSAGE ${data}`);
+});
diff --git a/config.json.vagrant b/config.json.vagrant
index 6d316a1..1dbaf8f 100644
--- a/config.json.vagrant
+++ b/config.json.vagrant
@@ -2,5 +2,5 @@
     "port": "8080",
 
     "tag_reader": ["./bin/tag-reader-dummy"],
-    "mpg321": ["./bin/mpg321-dummy"]
+    "mpg321": ["node", "./bin/mpg321-dummy"]
 }
diff --git a/jukebox/child-process.js b/jukebox/child-process.js
index 873ae9c..3c0f23d 100644
--- a/jukebox/child-process.js
+++ b/jukebox/child-process.js
@@ -11,6 +11,7 @@ module.exports.ChildProcessEmitter = class ChildProcessEmitter extends EventEmit
     super();
 
     this.logger = logger;
+    this.stderrFilters = [];
 
     var cmd = command[0],
         args = command.slice(1);
@@ -26,14 +27,21 @@ module.exports.ChildProcessEmitter = class ChildProcessEmitter extends EventEmit
     });
 
     this.childProcess.stdout.on('data', (data) => {
-      var s = data.toString(), lines = s.split(/\n/g);
-      for (var i = 0, l = lines.length; i < l; i++) {
-        this.emit('message', lines[i]);
-      }
+      var lines = data.toString().split(/\n/g);
+      lines.map(line => line.trim())
+        .filter(line => line.length)
+        .map(line => this.emit('message', line));
     });
 
     this.childProcess.stderr.on('data', (data) => {
-      this.logger.error('process stderr', { class: this.constructor.name, stderr: String(data).trim()});
+      var line = data.toString().trim();
+      var filtered = this.stderrFilters.reduce((filter, filtered) => {
+        return filtered || filter(line);
+      }, false);
+      if (filtered) {
+        return;
+      }
+      this.logger.error('process stderr', { class: this.constructor.name, stderr: line});
     });
   }
 
diff --git a/jukebox/media-player.js b/jukebox/media-player.js
index 7703b53..a8014ef 100644
--- a/jukebox/media-player.js
+++ b/jukebox/media-player.js
@@ -5,6 +5,9 @@ const ChildProcessEmitter = require('./child-process').ChildProcessEmitter;
 class MediaPlayer extends ChildProcessEmitter {
     constructor(config, logger) {
       super(config.mpg321, logger);
+      this.stderrFilters.push(line => {
+        return line.substr(0, 3) == '@F '
+      });
     }
 }
 
diff --git a/player.js b/player.js
index 6ed45d8..38f1525 100644
--- a/player.js
+++ b/player.js
@@ -45,13 +45,13 @@ function exitHandler(options, err) {
 process.on('exit', exitHandler.bind(null));
 process.on('SIGINT', exitHandler.bind(null, {exit:true}));
 
-TagReader.on('message', (data) => {
+TagReader.on('message', data => {
   processLine(data);
 });
 
 if (config.debug) {
-  MediaPlayer.on('message', (data) => {
-    logger.debug("mediaplayer send message", { line: data });
+  MediaPlayer.on('message', line => {
+    logger.debug("mediaplayer sent message", { line: line });
   });
 }
 
@@ -66,7 +66,7 @@ function lookup(tag, cb) {
     return cb('PAUSE', 2);
   }
 
-  glob('media/' + tag + ' - *.mp3', function(er, files) {
+  glob('media/' + tag + ' - *.mp3', (er, files) => {
     if (files.length > 0) {
       appendLog(files[0]);
       return cb("LOAD " + files[0], 5);