diff --git a/src/testdata/plus_three_sounds_nice.txt b/src/testdata/plus_three_sounds_nice.txt
new file mode 100644
index 0000000..fe2df12
--- /dev/null
+++ b/src/testdata/plus_three_sounds_nice.txt
@@ -0,0 +1,12 @@
+#CM0 CM3 CM4 CM0
+#CM1 CM4 CM0
+#CM0 CM4 CM5 CM3
+
+# 1 4 6 4 # pop101
+#GM0 GM3 GM5 GM3
+
+60
+63
+66
+69
+72
diff --git a/src/testdata/sandbox.txt b/src/testdata/sandbox.txt
index 080938a..fe2df12 100644
--- a/src/testdata/sandbox.txt
+++ b/src/testdata/sandbox.txt
@@ -7,3 +7,6 @@
 
 60
 63
+66
+69
+72