Added temporary experimental code to be formalised.

.idea/.gitignore

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+# Default ignored files
+/workspace.xml

.idea/google-java-format.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GoogleJavaFormatSettings">
+    <option name="enabled" value="false" />
+  </component>
+</project>

.idea/libraries/lib.xml

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+<component name="libraryTable">
+  <library name="lib">
+    <CLASSES>
+      <root url="file://$PROJECT_DIR$/lib" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES>
+      <root url="file://$PROJECT_DIR$/lib" />
+    </SOURCES>
+    <jarDirectory url="file://$PROJECT_DIR$/lib" recursive="false" />
+    <jarDirectory url="file://$PROJECT_DIR$/lib" recursive="false" type="SOURCES" />
+  </library>
+</component>

.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="JavaScriptSettings">
+    <option name="languageLevel" value="ES6" />
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_13" default="false" project-jdk-name="13" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

.idea/modules.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/oscilloscope-experiments.iml" filepath="$PROJECT_DIR$/.idea/oscilloscope-experiments.iml" />
+    </modules>
+  </component>
+</project>

.idea/oscilloscope-experiments.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/test" isTestSource="true" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="lib" level="project" />
+  </component>
+</module>

.idea/vcs.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>

src/AudioClient.java

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+import com.xtaudio.xt.*;
+
+public class AudioClient {
+
+  static double phase = 0.0;
+  static final XtFormat FORMAT = new XtFormat(new XtMix(192000, XtSample.FLOAT32), 0, 0, 2, 0);
+  static float count = 1;
+
+  static void render(XtStream stream, Object input, Object output, int frames,
+                     double time, long position, boolean timeValid, long error, Object user) {
+
+    XtFormat format = stream.getFormat();
+
+    count++;
+
+    for (int f = 0; f < frames; f++) {
+      float sine = nextSine(format.mix.rate, count * 0.05);
+      float cos = nextCos(format.mix.rate, count * 0.05);
+
+      for (int c = 0; c < format.outputs; c++) {
+        float x1 = -Math.min(0.01f * count, 1);;
+        float y1 = 0;
+        float x2 = Math.min(0.01f * count, 1);
+        float y2 = 0.5f;
+
+        float xMid = (x1 + x2) / 2f;
+        float yMid = (y1 + y2) / 2f;
+
+        ((float[]) output)[f * format.outputs] = xMid + (Math.abs(x2 - x1) / 2f) * sine;
+        ((float[]) output)[f * format.outputs + 1] = yMid + (Math.abs(y2 - y1) / 2f) * sine;
+      }
+    }
+  }
+
+  static float nextSine(double sampleRate, double frequency) {
+    phase += frequency / sampleRate;
+    if (phase >= 1.0)
+      phase = -1.0;
+    return (float) Math.sin(phase * Math.PI);
+  }
+
+  static float nextCos(double sampleRate, double frequency) {
+    phase += frequency / sampleRate;
+    if (phase >= 1.0)
+      phase = -1.0;
+    return (float) Math.cos(phase * Math.PI);
+  }
+
+  public static void main(String[] args) throws Exception {
+
+    try (XtAudio audio = new XtAudio(null, null, null, null)) {
+      XtService service = XtAudio.getServiceBySetup(XtSetup.CONSUMER_AUDIO);
+      try (XtDevice device = service.openDefaultDevice(true)) {
+        if (device != null && device.supportsFormat(FORMAT)) {
+
+          XtBuffer buffer = device.getBuffer(FORMAT);
+          try (XtStream stream = device.openStream(FORMAT, true, false,
+            buffer.current, AudioClient::render, null, null)) {
+            stream.start();
+            Thread.sleep(10000);
+            stream.stop();
+          }
+        }
+      }
+    }
+  }
+}