diff --git a/SCClassLibrary/Common/Control/asScore/ScoreStreamPlayer.sc b/SCClassLibrary/Common/Control/asScore/ScoreStreamPlayer.sc
index 9fd56d0491a..6344219efd0 100644
--- a/SCClassLibrary/Common/Control/asScore/ScoreStreamPlayer.sc
+++ b/SCClassLibrary/Common/Control/asScore/ScoreStreamPlayer.sc
@@ -42,10 +42,10 @@ ScoreStreamPlayer : Server {
 	prepareEvent { | event |
 		event = event.copy;
 		event.use({
-			~schedBundle = { | lag, offset, server ...bundle |
+			~schedBundle = flop { | lag, offset, server ... bundle |
 				this.add(offset * tempo + lag + beats, bundle)
 			};
-			~schedBundleArray = { | lag, offset, server, bundle |
+			~schedBundleArray = flop { | lag, offset, server, bundle |
 				this.add(offset * tempo + lag + beats, bundle)
 			};
 		});
@@ -57,10 +57,10 @@ ScoreStreamPlayer : Server {
 		proto = (
 			server: this,
 
-			schedBundle: { | lag, offset, server ...bundle |
+			schedBundle: flop { | lag, offset, server ...bundle |
 				this.add(offset * tempo + lag + beats, bundle)
 			},
-			schedBundleArray: { | lag, offset, server, bundle |
+			schedBundleArray: flop { | lag, offset, server, bundle |
 				this.add(offset * tempo + lag + beats, bundle)
 			}
 		);
diff --git a/testsuite/classlibrary/TestScore.sc b/testsuite/classlibrary/TestScore.sc
new file mode 100644
index 00000000000..423fb270c70
--- /dev/null
+++ b/testsuite/classlibrary/TestScore.sc
@@ -0,0 +1,48 @@
+TestScore : UnitTest {
+
+	test_pattern_asScore_lag {
+		var events, score, s_new_messages, onsetTimes;
+		events = [(x: 0, lag: 0.5), (x: 1, dur: 0.5), (x: 2, lag: 0.5)];
+		score = Pseq(events).asScore(3);
+		s_new_messages = score.score.drop(1).select { |x| x[2] == \default };
+		onsetTimes = s_new_messages.collect { |x| x.first };
+		this.assertEquals(onsetTimes, [0.5, 1, 2], "onsets should be correctly derived from lag and dur");
+	}
+
+	test_pattern_asScore_timingOffset {
+		var events, score, s_new_messages, onsetTimes;
+		events = [(x: 0, timingOffset: 0.5), (x: 1, dur: 0.5), (x: 2, timingOffset: 0.5)];
+		score = Pseq(events).asScore(3);
+		s_new_messages = score.score.drop(1).select { |x| x[2] == \default };
+		onsetTimes = s_new_messages.collect { |x| x.first };
+		this.assertEquals(onsetTimes, [0.5, 1, 2], "onsets should be correctly derived from timingOffset and dur");
+	}
+
+	test_pattern_asScore_lag_multichannel {
+		var events, score, s_new_messages, onsetTimes;
+		events = [(x: 0, lag: [0.5, 1, 2])];
+		score = Pseq(events).asScore(3);
+		s_new_messages = score.score.drop(1).select { |x| x[2] == \default };
+		onsetTimes = s_new_messages.collect { |x| x.first };
+		this.assertEquals(onsetTimes, [0.5, 1, 2], "onsets should be correctly derived from lag in multichannel expanding");
+	}
+
+	test_pattern_asScore_timingOffset_multichannel {
+		var events, score, s_new_messages, onsetTimes;
+		events = [(x: 0, timingOffset: [0.5, 1, 2])];
+		score = Pseq(events).asScore(3);
+		s_new_messages = score.score.drop(1).select { |x| x[2] == \default };
+		onsetTimes = s_new_messages.collect { |x| x.first };
+		this.assertEquals(onsetTimes, [0.5, 1, 2], "onsets should be correctly derived from timingOffset in multichannel expanding");
+	}
+
+	test_pattern_asScore_timingValues_multichannel {
+		var events, score, s_new_messages, onsetTimes;
+		events = [(x: 0, timingOffset: [0.5, 1, 2], lag: [0.3, 0.7, 1])];
+		score = Pseq(events).asScore(4);
+		s_new_messages = score.score.drop(1).select { |x| x[2] == \default };
+		onsetTimes = s_new_messages.collect { |x| x.first };
+		this.assertEquals(onsetTimes, [0.5, 1, 2] + [0.3, 0.7, 1], "onsets should be correctly derived from lag and timingOffset in multichannel expanding");
+	}
+
+}