working demo, click button for feedback ;)

src/coffee/app.coffee

@@ -3,4 +3,13 @@ define (require) ->
     alert("Can't access your media :(")
     return
 
-  getUserMedia = require('getUserMedia')
+  $ = require 'jquery'
+  Audio = require 'lib/captureAudio'
+
+  buttonAudio = new Audio()
+
+  $('.button.record').on 'click', (ev) ->
+    audioStream = buttonAudio.get()
+    .then (streamSource) ->
+      # loop the stream back through the computer... feedback, go!
+      streamSource.connect buttonAudio.context.destination

src/coffee/lib/captureAudio.coffee

@@ -0,0 +1,16 @@
+define (require) ->
+  MediaCapture = require 'lib/mediaCapture'
+
+  class Audio
+    constructor: (ctx) ->
+      @audioContext = ctx || window.AudioContext || window.webkitAudioContext
+      @context = new @audioContext()
+
+    get: ->
+      audio = new MediaCapture
+        video: false
+
+      audio.get()
+      .then (audioStream) =>
+        @mediaStreamSource = @context.createMediaStreamSource( audioStream )
+        return @mediaStreamSource

src/coffee/lib/mediaCapture.coffee

@@ -0,0 +1,13 @@
+define (require) ->
+  Promise = require 'bluebird'
+  require 'lib/getUserMedia' # create navigator.getUserMedia
+
+  class MediaCapture
+    constructor: (opts={}) ->
+      @opts =
+        video: if (opts.video?) then opts.video else true
+        audio: if (opts.audio?) then opts.video else true
+
+    get: ->
+      new Promise (resolve, reject) =>
+        navigator.getUserMedia @opts, resolve, reject