diff --git a/AudioSender.js b/AudioSender.js
index 833bdb8..154074d 100644
--- a/AudioSender.js
+++ b/AudioSender.js
@@ -5,12 +5,11 @@ const dispatcher = new Dispatcher('AudioSender', ['begin', 'end', 'send']);
 let audioContext;
 let CHANNELS = [];
 let DESTINATION;
-let ON_START;
-let ON_STOP;
-let ON_SEND;
 let CHANNEL_OSCILLATORS = [];
 let WAVE_FORM;
 
+let futureEventIds = [];
+
 let stopOscillatorsTimeoutId;
 
 export const addEventListener = dispatcher.addListener;
@@ -19,16 +18,10 @@ export const removeEventListener = dispatcher.removeListener;
 export const changeConfiguration = ({
   channels,
   destination,
-  startCallback,
-  stopCallback,
-  sendCallback,
   waveForm
 }) => {
   CHANNELS = channels;
   DESTINATION = destination;
-  ON_START = startCallback;
-  ON_STOP = stopCallback;
-  ON_SEND = sendCallback;
   WAVE_FORM = waveForm;
 }
 
@@ -85,7 +78,21 @@ export function send(bits, startSeconds) {
     const hz = channel[isHigh ? 1 : 0];
     oscillator.frequency.setValueAtTime(hz, startSeconds);
   });
-  dispatcher.emit('send', {bits: sentBits, startSeconds});
+
+  // Alghough we program an oscillator of when frequencies
+  // should change, let's not emit that the data is sent
+  // until the frequency actually changes in real-time
+  futureEventIds.push(window.setTimeout(
+    () => {
+      dispatcher.emit('send', {bits: sentBits, startSeconds});
+    }, delayMs(startSeconds)
+  ));
+}
+const delayMs = (seconds) => {
+  const time = now();
+  // now or in the past, no delay
+  if(time >= seconds) return 0;
+  return (seconds - time) * 1000;
 }
 const stopTimeout = () => {
   if(stopOscillatorsTimeoutId) {
@@ -105,7 +112,7 @@ export function stopAt(streamEndSeconds) {
   stopTimeout();
   stopOscillatorsTimeoutId = window.setTimeout(
     stop,
-    (streamEndSeconds - now()) * 1000
+    delayMs(streamEndSeconds)
   );
 }
 export function stop() {
@@ -118,6 +125,8 @@ export function stop() {
     }
   )
   oscillators.length = 0;
+  futureEventIds.forEach(window.clearTimeout);
+  futureEventIds.length = 0;
   dispatcher.emit('end');
   stopTimeout();
 }
diff --git a/Panels/BasePanel.js b/Panels/BasePanel.js
new file mode 100644
index 0000000..9f36abe
--- /dev/null
+++ b/Panels/BasePanel.js
@@ -0,0 +1,150 @@
+import Dispatcher from "../Dispatcher";
+
+let lastId = 0;
+const clamp = (value, min, max) => Math.max(min, Math.min(value, max));
+
+class BasePanel {
+  constructor(title) {
+    this.dispatcher = new Dispatcher(title);
+    this.id = `panel-${lastId++}`;
+    this.panel = document.createElement('div');
+    this.panel.id = this.id;
+    const h2 = document.createElement('h2');
+    h2.innerText = title;
+    this.panel.appendChild(h2);
+    this.container = document.createElement('div');
+    this.panel.appendChild(this.container);
+  }
+  getDomElement = () => this.panel;
+  addSection = text => {
+    const header = document.createElement('h4');
+    header.innerText = text;
+    this.append(header);
+  }
+  addRadios = (name, items) => {
+    this.addCheckedInputs('radio', name, items);
+  };
+  addCheckboxes = (name, items) => {
+    this.addCheckedInputs('checkbox', name, items);
+  };
+  addCheckedInputs = (type, name, items, value) => {
+    items.forEach(({id, text, checked = false, eventName = 'change'}, index)=> {
+      const label = document.createElement('label');
+      const input = document.createElement('input');
+      input.type = type;
+      input.name = name;
+      input.checked = checked;
+      input.value = value;
+      input.id = id;
+      input.addEventListener('change', e => {
+        this.dispatcher.emit(eventName, {
+          panel: this.id,
+          name,
+          id,
+          index,
+          checked: e.target.checked,
+          value
+        });
+      })
+      label.appendChild(input);
+      const textNode = document.createTextNode(text);
+      label.append(textNode);
+      this.append(label);
+      const br = document.createElement('br');
+      this.append(br);
+    });
+  }
+  addInputText = (id, value, eventName = 'input') => {
+    const input = document.createElement('input');
+    input.type = 'text';
+    input.value = value;
+    input.id = id;
+    input.addEventListener('input', e => {
+      this.dispatcher.emit(eventName, {
+        panel: this.id,
+        id,
+        value
+      });
+    });
+    this.append(input);
+  }
+  addButton = (id, text, eventName = 'click') => {
+    const button = document.createElement('button');
+    button.id = id;
+    button.innerText = text;
+    button.addEventListener('click', e => {
+      this.dispatcher.emit(eventName, {
+        panel: this.id,
+        id,
+        text
+      });
+    });
+    this.append(button);
+  }
+  addProgressBar = (id, percent) => {
+    const progressBar = document.createElement('div');
+    progressBar.className = 'progress-container';
+    const bar = document.createElement('div');
+    bar.id = id;
+    bar.className = 'progress-bar';
+    bar.style.width = `${clamp(percent, 0, 1) * 100}%`;
+    progressBar.append(bar);
+    this.append(progressBar);
+  }
+  setProgressById = (id, percent) => {
+    const element = document.getElementById(id);
+    if(!element) throw new Error(`Unable to find ${id}`);
+    element.style.width = `${clamp(percent, 0, 1) * 100}%`;
+  }
+  addCode = (id, value, type = '') => {
+    const code = document.createElement('div');
+    code.id = id;
+    code.innerText = value;
+    code.className = type === '' ? 'raw-data' : `raw-data-${type}`;
+    this.append(code);
+  }
+  setValueById = (id, value) => {
+    const element = document.getElementById(id);
+    if(!element) throw new Error(`Unable to find ${id}`);
+    switch(element.tagName) {
+      case 'INPUT':
+      case 'SELECT':
+        element.value = value;
+        break;
+      default:
+        element.innerText = value;
+    }
+  }
+  setHtmlById = (id, html) => {
+    const element = document.getElementById(id);
+    if(!element) throw new Error(`Unable to find ${id}`);
+    element.innerHTML = html;
+  }
+  getValueById = (id) => {
+    const element = document.getElementById(id);
+    if(!element) throw new Error(`Unable to find ${id}`);
+    switch(element.tagName) {
+      case 'INPUT':
+      case 'SELECT':
+        return element.value;
+      default:
+        return element.innerText;
+    }
+  }
+  setCheckedById = (id, checked) => {
+    const element = document.getElementById(id);
+    if(!element) throw new Error(`Unable to find ${id}`);
+    element.checked = checked;
+  }
+  getCheckedById = (id) => {
+    const element = document.getElementById(id);
+    if(!element) throw new Error(`Unable to find ${id}`);
+    return element.checked;
+  }
+  append = (element) => this.container.appendChild(element);
+  clear = () => this.container.innerHTML = '';
+  addEventListener = (eventName, callback) => this.dispatcher.addListener(eventName, callback);
+  removeEventListener = (eventName, callback) => this.dispatcher.removeListener(eventName, callback);
+}
+
+export default BasePanel;
\ No newline at end of file
diff --git a/Panels/CommunicationsPanel.js b/Panels/CommunicationsPanel.js
new file mode 100644
index 0000000..8fccd8a
--- /dev/null
+++ b/Panels/CommunicationsPanel.js
@@ -0,0 +1,24 @@
+import BasePanel from './BasePanel';
+
+class CommunicationsPanel extends BasePanel {
+  constructor() {
+    super('Communications');
+    this.addSection('Send');
+    this.addRadios('send-via', [
+      {text: 'Analyzer', id: 'send-via-analyzer', eventName: 'sendAnalyzerChange'},
+      {text: 'Speakers', id: 'send-via-speaker', eventName: 'sendSpeakersChange'}
+    ]);
+    this.addSection('Receive');
+    this.addCheckboxes('receive-via', [
+      {text: 'Listening', id: 'is-listening-checkbox', eventName: 'listeningChange'}
+    ]);
+  }
+  isListeningChecked = () => {
+    return this.getCheckedById('is-listening-checkbox');
+  }
+  setListening = checked => this.setCheckedById('is-listening-checkbox', checked);
+  setSendSpeakers = checked => this.setCheckedById('send-via-speaker', checked);
+  setSendAnalyzer = checked => this.setCheckedById('send-via-analyzer', checked);
+}
+
+export default CommunicationsPanel;
\ No newline at end of file
diff --git a/Panels/MessagePanel.js b/Panels/MessagePanel.js
new file mode 100644
index 0000000..8252e3f
--- /dev/null
+++ b/Panels/MessagePanel.js
@@ -0,0 +1,20 @@
+import BasePanel from './BasePanel';
+
+class MessagePanel extends BasePanel {
+  constructor() {
+    super('Message');
+    this.addInputText('text-to-send', '', 'messageChange');
+    this.addButton('send-button', 'Send', 'send');    
+    this.addSection('Received');
+    this.addProgressBar('received-progress', .50);
+    this.addCode('decoded-text', '', 'small');
+  }
+  getSendButtonText = () => this.getValueById('send-button');
+  setSendButtonText = text => this.setValueById('send-button', text);
+  setMessage = text => this.setValueById('text-to-send', text);
+  getMessage = () => this.getValueById('text-to-send');
+  setProgress = percent => this.setProgressById('received-progress', percent);
+  setReceived = (html) => this.setHtmlById('decoded-text', html);
+}
+
+export default MessagePanel;
\ No newline at end of file
diff --git a/index.html b/index.html
index a9761c4..68d8a6f 100644
--- a/index.html
+++ b/index.html
@@ -9,37 +9,7 @@
 
 <body>
   <h1>Data Over Audio</h1>
-  <div class="panels">
-    <div>
-      <h2>Communications</h2>
-      <div>
-        <h4>Send</h4>
-        <label>
-          <input type="radio" name="send-via" id="send-via-analyzer" checked>Analyzer
-        </label><br />
-        <label>
-          <input type="radio" name="send-via" id="send-via-speaker">Speakers
-        </label><br />
-        <h4>Receive</h4>
-        <label>
-          <input type="checkbox" id="is-listening-checkbox">Listening
-        </label>
-
-      </div>
-    </div>
-    <div>
-      <h2>Message</h2>
-      <div>
-        <input type="text" id="text-to-send">
-        <button id="send-button">Send</button><br />
-        <h4>Received</h4>
-        <div class="progress-container">
-          <div id="received-progress" class="progress-bar"></div>
-        </div>
-        <div class="raw-data-small" id="decoded-text"></div><br />
-
-      </div>
-    </div>
+  <div class="panels" id="panel-container">
     <div>
       <h2>Encoded segments to send</h2>
       <div>
diff --git a/index.js b/index.js
index c924660..2cb4186 100644
--- a/index.js
+++ b/index.js
@@ -7,11 +7,10 @@ import * as Randomizer from './Randomizer';
 import * as AudioSender from './AudioSender';
 import * as AudioReceiver from './AudioReceiver';
 import * as CRC from './CRC.js';
+import CommunicationsPanel from './Panels/CommunicationsPanel';
+import MessagePanel from "./Panels/MessagePanel.js";
 
 var audioContext;
-var sendButton;
-var textToSend;
-var isListeningCheckbox;
 var microphoneStream;
 var microphoneNode;
 var analyser;
@@ -23,21 +22,14 @@ var MAX_AMPLITUDE = 300; // Higher than 255 to give us space
 const MAXIMUM_PACKETIZATION_SIZE_BITS = 16;
 const CRC_BIT_COUNT = 8;
 
-// bits as they arrived
-let RECEIVED_SEGMENT_BITS = []; // RECEIVED_SEGMENT_BITS[packetIndex][segmentIndex][channel] = bit
-
 // bits as they are sent
 let SENT_ORIGINAL_TEXT = '';
 let SENT_ORIGINAL_BITS = []; // original bits
 let SENT_ENCODED_BITS = []; // bits with error encoding
 let SENT_TRANSFER_BITS = []; // bits sent in the transfer
 
-// interval and timeout ids
-let stopOscillatorsTimeoutId;
-
 let EXCLUDED_CHANNELS = [];
 
-var TEXT_TO_SEND = "U";
 var MAX_BITS_DISPLAYED_ON_GRAPH = 79;
 var SEGMENT_DURATION = 30;
 var AMPLITUDE_THRESHOLD_PERCENT = .75;
@@ -69,12 +61,36 @@ var PAUSE = false;
 var PAUSE_AFTER_END = true;
 var PACKET_SIZE_BITS = 5; // 32 bytes, 256 bits
 
+const communicationsPanel = new CommunicationsPanel();
+const messagePanel = new MessagePanel();
+
 function handleWindowLoad() {
-  TEXT_TO_SEND = Randomizer.text(5);
+  const panelContainer = document.getElementById('panel-container');
+  panelContainer.prepend(messagePanel.getDomElement());
+  panelContainer.prepend(communicationsPanel.getDomElement());
+
+  // Initialize Values
+  communicationsPanel.setListening(false);
+  communicationsPanel.setSendSpeakers(false);
+  communicationsPanel.setSendAnalyzer(true);
+
+  messagePanel.setMessage(Randomizer.text(5));
+  messagePanel.setProgress(0);
+  messagePanel.setReceived('');
+  messagePanel.setSendButtonText('Send');
+
+  // Communications Events
+  communicationsPanel.addEventListener('listeningChange', handleChangeListening);
+  communicationsPanel.addEventListener('sendSpeakersChange', handleChangeSendSpeakers);
+  communicationsPanel.addEventListener('sendAnalyzerChange', handleChangeSendAnalyzer);
+
+  messagePanel.addEventListener('messageChange', configurationChanged);
+  messagePanel.addEventListener('send', handleSendButtonClick);
+
   // Setup audio sender
-  AudioSender.addEventListener('begin', () => sendButton.innerText = 'Stop');
+  AudioSender.addEventListener('begin', () => messagePanel.setSendButtonText('Stop'));
   AudioSender.addEventListener('send', handleAudioSenderSend);
-  AudioSender.addEventListener('end', () => sendButton.innerText = 'Send');
+  AudioSender.addEventListener('end', () => messagePanel.setSendButtonText('Send'));
   // Setup audio receiver
   AudioReceiver.addEventListener('begin', handleAudioReceiverStart);
   AudioReceiver.addEventListener('receive', handleAudioReceiverReceive);
@@ -83,12 +99,8 @@ function handleWindowLoad() {
   StreamManager.addEventListener('change', handleStreamManagerChange);
 
   // grab dom elements
-  sendButton = document.getElementById('send-button');
-  isListeningCheckbox = document.getElementById('is-listening-checkbox');
   receivedDataTextarea = document.getElementById('received-data');
   receivedGraph = document.getElementById('received-graph');
-  textToSend = document.getElementById('text-to-send');
-  textToSend.value = TEXT_TO_SEND;
   sentDataTextArea = document.getElementById('sent-data');
   const receivedChannelGraph = document.getElementById('received-channel-graph');
   receivedChannelGraph.addEventListener('mouseover', handleReceivedChannelGraphMouseover);
@@ -125,11 +137,6 @@ function handleWindowLoad() {
     PAUSE_AFTER_END = event.target.checked;
     if(!PAUSE_AFTER_END) resumeGraph();
   })
-  document.getElementById('send-via-speaker').checked = SEND_VIA_SPEAKER;
-  document.getElementById('send-via-speaker').addEventListener('input', event => {
-    SEND_VIA_SPEAKER = event.target.checked;
-    configurationChanged();
-  })
   document.getElementById('frequency-resolution-multiplier').value = FREQUENCY_RESOLUTION_MULTIPLIER;
   document.getElementById('frequency-resolution-multiplier').addEventListener('input', event => {
     FREQUENCY_RESOLUTION_MULTIPLIER = parseInt(event.target.value);
@@ -185,9 +192,6 @@ function handleWindowLoad() {
   });
   document.getElementById('audio-context-sample-rate').innerText = getAudioContext().sampleRate.toLocaleString();
   // wire up events
-  sendButton.addEventListener('click', handleSendButtonClick);
-  isListeningCheckbox.addEventListener('click', handleListeningCheckbox);
-  textToSend.addEventListener('input', configurationChanged);
   configurationChanged();
 }
 
@@ -313,7 +317,7 @@ function updatePacketUtils() {
   });
 }
 function updatePacketStats() {
-  const text = textToSend.value;
+  const text = messagePanel.getMessage();
   const bits = textToBits(text);
   const byteCount = text.length;
   const bitCount = PacketUtils.getPacketizationBitCountFromBitCount(bits.length);;
@@ -553,7 +557,7 @@ function stopGraph() {
 }
 
 function resumeGraph() {
-  if(isListeningCheckbox.checked) {
+  if(communicationsPanel.isListeningChecked()) {
     if(PAUSE) {
       PAUSE = false;
       AudioReceiver.start();
@@ -873,12 +877,12 @@ function bitsToText(bits) {
   return bytesToText(bytes.buffer);
 }
 function handleSendButtonClick() {
-  if(sendButton.innerText === 'Stop') {
+  if(messagePanel.getSendButtonText() === 'Stop') {
     AudioSender.stop();
   } else {
     AudioReceiver.reset();
     StreamManager.reset();
-    const text = document.getElementById('text-to-send').value;
+    const text = messagePanel.getMessage();
     sendBytes(textToBytes(text));
   }
 }
@@ -889,7 +893,15 @@ function getAnalyser() {
   analyser.fftSize = 2 ** FFT_SIZE_POWER;
   return analyser;
 }
-function handleListeningCheckbox(e) {
+function handleChangeSendAnalyzer({checked}) {
+  SEND_VIA_SPEAKER = !checked;
+  configurationChanged();
+}
+function handleChangeSendSpeakers({checked}) {
+  SEND_VIA_SPEAKER = checked;
+  configurationChanged();
+}
+function handleChangeListening({checked}) {
   stopGraph();
   var audioContext = getAudioContext();
   function handleMicrophoneOn(stream) {
@@ -902,7 +914,7 @@ function handleListeningCheckbox(e) {
   function handleMicrophoneError(error) {
     console.error('Microphone Error', error);
   }
-  if(e.target.checked) {
+  if(checked) {
     navigator.mediaDevices
       .getUserMedia({
         audio: {