diff --git a/src/Clock.ts b/src/Clock.ts
index 9ef51c9..6e8bb5c 100644
--- a/src/Clock.ts
+++ b/src/Clock.ts
@@ -127,7 +127,7 @@ export class Clock {
   }
 
   set bpm(bpm: number) {
-    if(bpm>0 && this._bpm !== bpm) {
+    if (bpm > 0 && this._bpm !== bpm) {
       this._bpm = bpm;
       this.transportNode?.setBPM(bpm);
     }
@@ -138,7 +138,7 @@ export class Clock {
   }
 
   set ppqn(ppqn: number) {
-    if(ppqn>0 && this._ppqn !== ppqn) {
+    if (ppqn > 0 && this._ppqn !== ppqn) {
       this._ppqn = ppqn;
       this.transportNode?.setPPQN(ppqn);
     }
@@ -154,23 +154,32 @@ export class Clock {
   public start(): void {
     /**
      * Starts the TransportNode (starts the clock).
+     *
+     * @remark also sends a MIDI message if a port is declared
      */
     this.app.audioContext.resume();
+    this.app.api.MidiConnection.sendStartMessage();
     this.transportNode?.start();
   }
 
   public pause(): void {
     /**
      * Pauses the TransportNode (pauses the clock).
+     *
+     * @remark also sends a MIDI message if a port is declared
      */
     this.transportNode?.pause();
+    this.app.api.MidiConnection.sendStopMessage();
   }
 
   public stop(): void {
     /**
      * Stops the TransportNode (stops the clock).
+     *
+     * @remark also sends a MIDI message if a port is declared
      */
     this.app.clock.tick = -1;
+    this.app.api.MidiConnection.sendStopMessage();
     this.transportNode?.stop();
   }
 }
diff --git a/src/IO/MidiConnection.ts b/src/IO/MidiConnection.ts
index acb81ef..d5b1ec7 100644
--- a/src/IO/MidiConnection.ts
+++ b/src/IO/MidiConnection.ts
@@ -54,6 +54,26 @@ export class MidiConnection {
     }
   }
 
+  public sendStartMessage(): void {
+    /**
+     * Sends a MIDI Start message to the currently selected MIDI output.
+     */
+    const output = this.midiOutputs[this.currentOutputIndex];
+    if (output) {
+      output.send([0xfa]); // Send MIDI Start message
+    }
+  }
+
+  public sendStopMessage(): void {
+    /**
+     * Sends a MIDI Stop message to the currently selected MIDI output.
+     */
+    const output = this.midiOutputs[this.currentOutputIndex];
+    if (output) {
+      output.send([0xfc]); // Send MIDI Stop message
+    }
+  }
+
   public getCurrentMidiPortIndex(): number {
     /**
      * Returns the index of the currently selected MIDI output.
@@ -79,8 +99,6 @@ export class MidiConnection {
     const output = this.midiOutputs[this.currentOutputIndex];
     if (output) {
       output.send([0xf8]); // Send a single MIDI clock message
-    } else {
-      console.error("MIDI output not available.");
     }
   }
 
diff --git a/src/TransportNode.js b/src/TransportNode.js
index 42c8a47..3d4d1e5 100644
--- a/src/TransportNode.js
+++ b/src/TransportNode.js
@@ -1,53 +1,52 @@
 import { tryEvaluate } from "./Evaluator";
-const zeroPad = (num, places) => String(num).padStart(places, '0')
+const zeroPad = (num, places) => String(num).padStart(places, "0");
 
 export class TransportNode extends AudioWorkletNode {
+  constructor(context, options, application) {
+    super(context, "transport", options);
+    this.app = application;
+    this.port.addEventListener("message", this.handleMessage);
+    this.port.start();
+    this.timeviewer = document.getElementById("timeviewer");
+  }
 
-    constructor(context, options, application) {
-        super(context, "transport", options);
-        this.app = application
-        this.port.addEventListener("message", this.handleMessage);
-        this.port.start();
-		this.timeviewer = document.getElementById("timeviewer");
+  /** @type {(this: MessagePort, ev: MessageEvent<any>) => any} */
+  handleMessage = (message) => {
+    if (message.data && message.data.type === "bang") {
+      this.app.clock.tick++;
+      const futureTimeStamp = this.app.clock.convertTicksToTimeposition(
+        this.app.clock.tick
+      );
+      this.app.clock.time_position = futureTimeStamp;
+      this.timeviewer.innerHTML = `${zeroPad(futureTimeStamp.bar, 2)}:${
+        futureTimeStamp.beat + 1
+      }:${zeroPad(futureTimeStamp.pulse, 2)}`;
+      this.app.api.MidiConnection.sendMidiClock();
+      if (this.app.exampleIsPlaying) {
+        tryEvaluate(this.app, this.app.example_buffer);
+      } else {
+        tryEvaluate(this.app, this.app.global_buffer);
+      }
     }
+  };
 
-    /** @type {(this: MessagePort, ev: MessageEvent<any>) => any} */
-    handleMessage = (message) => {
-        if (message.data && message.data.type === "bang") {
+  start() {
+    this.port.postMessage("start");
+  }
 
-            this.app.clock.tick++
-            const futureTimeStamp = this.app.clock.convertTicksToTimeposition(this.app.clock.tick);
-            this.app.clock.time_position = futureTimeStamp;
-			this.timeviewer.innerHTML = `${zeroPad(futureTimeStamp.bar, 2)}:${futureTimeStamp.beat+1}:${zeroPad(futureTimeStamp.pulse, 2)}`;
-            
-            if (this.app.exampleIsPlaying) {
-                tryEvaluate(this.app, this.app.example_buffer);
-            } else {
-                tryEvaluate(this.app, this.app.global_buffer);
-            }
-              
-        }
-    };
+  pause() {
+    this.port.postMessage("pause");
+  }
 
+  setBPM(bpm) {
+    this.port.postMessage({ type: "bpm", value: bpm });
+  }
 
-    start() {
-        this.port.postMessage("start");
-    }
-
-    pause() {
-        this.port.postMessage("pause");
-    }
-
-    setBPM(bpm) {
-        this.port.postMessage({ type: "bpm", value: bpm });
-    }
-
-    setPPQN(ppqn) {
-        this.port.postMessage({ type: "ppqn", value: ppqn });
-    }
-
-    stop() {
-        this.port.postMessage("stop");
-    }
+  setPPQN(ppqn) {
+    this.port.postMessage({ type: "ppqn", value: ppqn });
+  }
 
+  stop() {
+    this.port.postMessage("stop");
+  }
 }
diff --git a/src/main.ts b/src/main.ts
index c938639..ec39307 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -66,8 +66,6 @@ const bindings = Object.keys(classMap).map((key) => ({
   replace: (match, p1) => `<${key} class="${classMap[key]}" ${p1}>`,
 }));
 
-
-
 export class Editor {
   universes: Universes = template_universes;
   selected_universe: string;
@@ -487,10 +485,12 @@ export class Editor {
           this.setButtonHighlighting("pause", true);
           this.isPlaying = !this.isPlaying;
           this.clock.pause();
+          this.api.MidiConnection.sendStopMessage();
         } else {
           this.setButtonHighlighting("play", true);
           this.isPlaying = !this.isPlaying;
           this.clock.start();
+          this.api.MidiConnection.sendStartMessage();
         }
       });
     });
@@ -562,12 +562,16 @@ export class Editor {
 
       if (this.settings.vimMode) {
         let vim = document.getElementById("vim-mode-radio") as HTMLInputElement;
-        let normal = document.getElementById("normal-mode-radio") as HTMLInputElement;
+        let normal = document.getElementById(
+          "normal-mode-radio"
+        ) as HTMLInputElement;
         vim.checked = true;
         normal.checked = false;
       } else {
         let vim = document.getElementById("vim-mode-radio") as HTMLInputElement;
-        let normal = document.getElementById("normal-mode-radio") as HTMLInputElement;
+        let normal = document.getElementById(
+          "normal-mode-radio"
+        ) as HTMLInputElement;
         normal.checked = true;
         vim.checked = false;
       }