add examples

examples/strumtest3.js

@@ -0,0 +1,13 @@
+setDefaultVoicings('legacy')
+
+const k = 0.01;
+
+stack(
+  n(stack("0@2 0 3@2 3 0 3",
+          "1@2 1 2@2 2 1 2".late(k),
+          "2@2 2 1@2 1 2 1".late(k*2),
+          "3@2 3 0@2 0 3 0".late(k*3)))
+     .chord("G!2 Bm E ".slow(4)).anchor("G4!2 F#4 A4".slow(4)).voicing()
+     .s("gm_electric_guitar_jazz").clip(1).release(0.2).gain(0.5),
+
+).cpm(140/4).pianoroll()