Add fall.js test.

tests/fall.js

@@ -0,0 +1,10 @@
+config.frameDivider = 1
+config.bufferSize = 32
+
+var v = 0
+function process(block) {
+	for (var i = 0; i < block.bufferSize; i++) {
+		block.outputs[0][i] = v
+		v -= block.sampleTime * 0.1
+	}
+}