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diff --git a/src/test/java/com/jsyn/unitgen/TestRamps.java b/src/test/java/com/jsyn/unitgen/TestRamps.java
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+++ b/src/test/java/com/jsyn/unitgen/TestRamps.java
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+/*
+ * Copyright 2009 Phil Burk, Mobileer Inc
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.jsyn.unitgen;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class TestRamps extends NonRealTimeTestCase {
+
+    public void viewContinuousRamp(double duration, double startValue, double targetValue)
+            throws InterruptedException {
+        ContinuousRamp ramp = new ContinuousRamp();
+        synthesisEngine.add(ramp);
+
+        ramp.current.set(startValue);
+        ramp.input.set(startValue);
+        ramp.time.set(duration);
+
+        synthesisEngine.setRealTime(false);
+        synthesisEngine.start();
+        ramp.start();
+        synthesisEngine.sleepUntil(synthesisEngine.getCurrentTime() + 0.01);
+        ramp.input.set(targetValue);
+
+        double time = synthesisEngine.getCurrentTime();
+        int numLoops = 20;
+        double increment = duration / numLoops;
+        for (int i = 0; i < (numLoops + 1); i++) {
+            double value = ramp.output.getValue();
+            System.out.printf("i = %d, t = %9.5f,  value = %8.4f\n", i, time, value);
+            time += increment;
+            synthesisEngine.sleepUntil(time);
+        }
+
+        synthesisEngine.stop();
+    }
+
+    public void checkContinuousRamp(double duration, double startValue, double targetValue)
+            throws InterruptedException {
+        ContinuousRamp ramp = new ContinuousRamp();
+        synthesisEngine.add(ramp);
+
+        ramp.current.set(startValue);
+        ramp.input.set(startValue);
+        ramp.time.set(duration);
+
+        synthesisEngine.setRealTime(false);
+        synthesisEngine.start();
+        ramp.start();
+        synthesisEngine.sleepUntil(synthesisEngine.getCurrentTime() + 0.01);
+        assertEquals(ramp.input.getValue(), ramp.output.getValue(), "start flat");
+
+        ramp.input.set(targetValue);
+        double startTime = synthesisEngine.getCurrentTime();
+        synthesisEngine.sleepUntil(startTime + (duration / 2));
+        assertEquals((targetValue + startValue) / 2.0, ramp.output.getValue(), 0.01, "ramping up");
+        synthesisEngine.sleepUntil(startTime + duration);
+        assertEquals(targetValue, ramp.output.getValue(), 0.01, "ramping up");
+        synthesisEngine.sleepUntil(startTime + duration + 0.1);
+        assertEquals(targetValue, ramp.output.getValue(), "flat again");
+
+        synthesisEngine.stop();
+    }
+
+    @Test
+    public void testContinuousRamp() throws InterruptedException {
+        viewContinuousRamp(4.0, 0.0, 1.0);
+    }
+
+    @Test
+    public void testExponentialRamp() throws InterruptedException {
+        ExponentialRamp ramp = new ExponentialRamp();
+        synthesisEngine.add(ramp);
+
+        double duration = 0.3;
+        ramp.current.set(1.0);
+        ramp.input.set(1.0);
+        ramp.time.set(duration);
+
+        synthesisEngine.start();
+        ramp.start();
+        synthesisEngine.sleepUntil(synthesisEngine.getCurrentTime() + 0.01);
+        assertEquals(ramp.input.getValue(), ramp.output.getValue(), "start flat");
+
+        ramp.input.set(8.0);
+        double startTime = synthesisEngine.getCurrentTime();
+        synthesisEngine.sleepUntil(startTime + 0.1);
+        assertEquals(2.0, ramp.output.getValue(), 0.01, "ramping up");
+        synthesisEngine.sleepUntil(startTime + 0.2);
+        assertEquals(4.0, ramp.output.getValue(), 0.01, "ramping up");
+        synthesisEngine.sleepUntil(startTime + 0.3);
+        assertEquals(8.0, ramp.output.getValue(), 0.01, "ramping up");
+        synthesisEngine.sleepUntil(startTime + 0.4);
+        assertEquals(8.0, ramp.output.getValue(), "flat again");
+    }
+
+    @Test
+    public void testLinearRamp() throws InterruptedException {
+        LinearRamp ramp = new LinearRamp();
+        synthesisEngine.add(ramp);
+
+        double duration = 0.4;
+        ramp.current.set(0.0);
+        ramp.input.set(0.0);
+        ramp.time.set(duration);
+
+        synthesisEngine.start();
+        ramp.start();
+        synthesisEngine.sleepUntil(synthesisEngine.getCurrentTime() + 0.01);
+        assertEquals(ramp.input.getValue(), ramp.output.getValue(), "start flat");
+
+        ramp.input.set(8.0);
+        double startTime = synthesisEngine.getCurrentTime();
+        synthesisEngine.sleepUntil(startTime + 0.1);
+        assertEquals(2.0, ramp.output.getValue(), 0.01, "ramping up");
+        synthesisEngine.sleepUntil(startTime + 0.2);
+        assertEquals(4.0, ramp.output.getValue(), 0.01, "ramping up");
+        synthesisEngine.sleepUntil(startTime + 0.3);
+        assertEquals(6.0, ramp.output.getValue(), 0.01, "ramping up");
+        synthesisEngine.sleepUntil(startTime + 0.4);
+        assertEquals(8.0, ramp.output.getValue(), "flat again");
+    }
+
+    @Test
+    public void testExponentialRampConnected() throws InterruptedException {
+        ExponentialRamp ramp = new ExponentialRamp();
+        PassThrough pass = new PassThrough();
+        synthesisEngine.add(ramp);
+        synthesisEngine.add(pass);
+
+        double duration = 0.3;
+        ramp.current.set(1.0);
+        pass.input.set(1.0);
+        ramp.time.set(duration);
+
+        // Send value through a connected unit.
+        pass.input.set(1.0);
+        pass.output.connect(ramp.input);
+
+        synthesisEngine.start();
+        ramp.start();
+        synthesisEngine.sleepUntil(synthesisEngine.getCurrentTime() + 0.01);
+        assertEquals(ramp.input.getValue(), ramp.output.getValue(), "start flat");
+
+        pass.input.set(8.0);
+        double startTime = synthesisEngine.getCurrentTime();
+        synthesisEngine.sleepUntil(startTime + 0.1);
+        assertEquals(2.0, ramp.output.getValue(), 0.01, "ramping up");
+        synthesisEngine.sleepUntil(startTime + 0.2);
+        assertEquals(4.0, ramp.output.getValue(), 0.01, "ramping up");
+        synthesisEngine.sleepUntil(startTime + 0.3);
+        assertEquals(8.0, ramp.output.getValue(), 0.01, "ramping up");
+        synthesisEngine.sleepUntil(startTime + 0.4);
+        assertEquals(8.0, ramp.output.getValue(), "flat again");
+    }
+
+    @Test
+    public void testLinearRampConnected() throws InterruptedException {
+        LinearRamp ramp = new LinearRamp();
+        PassThrough pass = new PassThrough();
+        synthesisEngine.add(ramp);
+        synthesisEngine.add(pass);
+
+        double duration = 0.4;
+        ramp.current.set(0.0);
+        pass.input.set(0.0);
+        ramp.time.set(duration);
+
+        // Send value through a connected unit.
+        pass.input.set(0.0);
+        pass.output.connect(ramp.input);
+
+        synthesisEngine.start();
+        ramp.start();
+        synthesisEngine.sleepUntil(synthesisEngine.getCurrentTime() + 0.01);
+        assertEquals(ramp.input.getValue(), ramp.output.getValue(), "start flat");
+
+        pass.input.set(8.0);
+        double startTime = synthesisEngine.getCurrentTime();
+        synthesisEngine.sleepUntil(startTime + 0.1);
+        assertEquals(2.0, ramp.output.getValue(), 0.01, "ramping up");
+        synthesisEngine.sleepUntil(startTime + 0.2);
+        assertEquals(4.0, ramp.output.getValue(), 0.01, "ramping up");
+        synthesisEngine.sleepUntil(startTime + 0.3);
+        assertEquals(6.0, ramp.output.getValue(), 0.01, "ramping up");
+        synthesisEngine.sleepUntil(startTime + 0.4);
+        assertEquals(8.0, ramp.output.getValue(), "flat again");
+    }
+
+}