diff --git a/Monkeydo.mjs b/Monkeydo.mjs
index 34ea401..8fb502d 100644
--- a/Monkeydo.mjs
+++ b/Monkeydo.mjs
@@ -26,8 +26,8 @@ export default class Monkeydo extends MonkeyMaster {
 		if(typeof times !== "number") {
 			times = parseInt(times);
 		}
-		// Clamp number to 8 bit max
-		times = Math.min(Math.max(times,0),255);
+		times = Math.floor(times);
+		times = Math.min(Math.max(times,0),255); // Clamp number to 8 bits
 		return await this.setFlag("playing",times);
 	}
 
@@ -38,4 +38,14 @@ export default class Monkeydo extends MonkeyMaster {
 		}
 		return await this.loadManifest(manifest);
 	}
+
+	async play(manifest = null) {
+		if(!this.ready && !manifest) throw new Error("Can not start playback without a manifest");
+		if(manifest) {
+			const load = this.load(manifest)
+			load.then(() => this.start());
+			return;
+		}
+		return await this.start();
+	}
 }
\ No newline at end of file
diff --git a/monkey/Monkey.js b/monkey/Monkey.js
index 04389de..557b068 100644
--- a/monkey/Monkey.js
+++ b/monkey/Monkey.js
@@ -6,6 +6,8 @@ class Monkey {
 	constructor() {
 		this.flags = new Uint8ClampedArray(2);
 		this.tasks = [];
+		this.tasksLength = 0;
+		this.i = 0;
 		// Runtime task queue
 		this.queue = {
 			thisTask: null,
@@ -15,21 +17,22 @@ class Monkey {
 
 	// Task scheduler
 	next() {
-		if(this.flags[0] === 0) return;
+		if(this.flags[0] === 0 || this.flags[1] === 0) return;
 		const task = this.tasks[this.i];
+		console.log(task,this.i);
 
 		// Run task after delay
 		this.queue.thisTask = setTimeout(() => {
 			// Dispatch task to main thread
-			this.postMessage(["TASK",task]);
+			postMessage(["TASK",task]);
 			this.i++;
 		},task[0]);
 
 		// Loop until flag is 0 or infinite if 255
-		if(this.i === this.tasks.length) {
+		if(this.i === this.tasksLength) {
 			this.i = 0;
-			if(flags[1] === 255) return;
-			flags[1]--;
+			if(this.flags[1] === 255) return;
+			this.flags[1]--;
 		}
 
 		// Queue the next task
@@ -52,6 +55,11 @@ class Monkey {
 	// Fetch and install manifest from URL
 	async fetchManifest(url) {
 		const manifest = await fetch(url);
+		if(!manifest.ok) {
+			console.error("Monkeydo fetch error:",manifest);
+			throw new Error("Server responded with an error");
+		};
+		
 		const json = await manifest.json();
 		return await this.loadManifest(json);
 	}
@@ -68,6 +76,8 @@ class Monkey {
 				}
 			}
 			this.tasks = manifest.tasks;
+			// Store length as property so we don't have to calculate the offset each iteration of next()
+			this.tasksLength = manifest.tasks.length - 1;
 			this.flags[0] = 1; // Manifest loaded: true
 			resolve();
 		});
diff --git a/monkey/MonkeyMaster.mjs b/monkey/MonkeyMaster.mjs
index e086f12..d6739d1 100644
--- a/monkey/MonkeyMaster.mjs
+++ b/monkey/MonkeyMaster.mjs
@@ -18,8 +18,7 @@ export default class MonkeyMaster {
 				// Copy flags and clear queue
 				const flags = [...this.queue._flags];
 				this.queue._flags = [];
-
-				flags.forEach(flag => this.setFlag(flag));
+				flags.forEach(flag => this.setFlag(...flag));
 			}
 		};
 	}
@@ -40,6 +39,11 @@ export default class MonkeyMaster {
 	async init() {
 		// Spawn and wrap dedicated worker with Comlink
 		const worker = new Worker(this.getWorkerPath());
+		worker.addEventListener("message",event => {
+			if(event.data[0] !== "TASK") return;
+			this.do(event.data);
+		});
+
 		const Monkey = Comlink.wrap(worker);
 		this.comlink = await new Monkey();
 
@@ -60,13 +64,14 @@ export default class MonkeyMaster {
 			"PLAYING"
 		];
 
+		
 		// Translate string to index
 		if(typeof flag === "string" || flag < 0) {
-			const key = flags.indexOf(flag.toUpperCase());
-			if(key < 0) return;
+			flag = flags.indexOf(flag.toUpperCase());
+			if(flag < 0) return;
 		}
 
-		// Check key is in bounds
+		// Check that key is in bounds
 		if(flag < 0 || flags > flags.length - 1) {
 			throw new Error(`Array key '${flag}' out of range`);
 		}
@@ -94,15 +99,28 @@ export default class MonkeyMaster {
 		return update;
 	}
 
+	// Load a Monkeydo manifest by URL or JSON string
 	async loadManifest(manifest) {
 		if(!this.ready) await this.init();
-		try {
-			const url = new URL(manifest);
-			this.comlink.fetchManifest(url.toString());
-		}
-		catch {
-			this.comlink.loadManifest(manifest);
-		}
-		return true;
+		return await new Promise((resolve,reject) => {
+			let load = null;
+			try {
+				const url = new URL(manifest);
+				load = this.comlink.fetchManifest(url.toString());
+			}
+			catch {
+				load = this.comlink.loadManifest(manifest);
+			}
+			load.then(() => resolve())
+			.catch(() => reject("Failed to load manifest"));
+		});
+	}
+
+	// Start playback of a loaded manifest
+	async start() {
+		// Set playstate if no value is present already
+		const loop = await this.getFlag("playing");
+		if(loop < 1) await this.setFlag("playing",1);
+		return await this.comlink.next();
 	}
 }
\ No newline at end of file