diff --git a/example.js b/example.js
index 4064224..e4bf9a1 100644
--- a/example.js
+++ b/example.js
@@ -14,7 +14,7 @@ atem.on('sourceConfiguration', function(id, config, info) {
 });
 
 atem.on('programBus', function(source) {
-	console.log('program bus changed to', source);
+	console.log('program bus changed to', source.source);
 });
 
 atem.ip = "10.1.0.210";
diff --git a/index.js b/index.js
index 776823e..f3f9151 100644
--- a/index.js
+++ b/index.js
@@ -753,28 +753,40 @@ function Device(atemIpAddress){
 	});
 
 	this.on('PrvI', function(d) {
-		const source = d.readUInt16BE(2),
+		const me = d.readUInt8(0);
+		const source = d.readUInt16BE(2)
 			inTransition = (d[4] & 1) === 1;
 
 		/**
 		 * When the selected preview bus changes this event will be fired.
 		 * @event Device#previewBus
-		 * @property {SourceID} source The new preview source
+		 * @property {number} me 0 for M/E 1, 1 for M/E 2
+		 * @property {number} source The new preview source
+		 * @property {boolean} inTransition Is this currently dissolving?
 		 */
-		atem.emit('previewBus', source, inTransition);
+		atem.emit('previewBus', {
+			me,
+			source, 
+			inTransition
+		});
 
 		// todo inspect the other bytes in PrvI
 	});
 
 	this.on('PrgI', function(d) {
+		const me = d.readUInt8(0);
 		const source = d.readUInt16BE(2);
 
 		/**
 		 * When the selected program bus changes this event will be fired.
 		 * @event Device#programBus
-		 * @property {SourceID} source The new program source
+		 * @property {number} me 0 for M/E 1, 1 for M/E 2
+		 * @property {number} source The new program source
 		 */
-		atem.emit('programBus', source);
+		atem.emit('programBus', {
+			me,
+			source
+		});
 		// todo inspect the other bytes in PrgI
 	});
 
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..e78269e
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,5 @@
+{
+  "name": "atem",
+  "version": "0.1.7",
+  "lockfileVersion": 1
+}