diff --git a/src/main_testtone.cc b/src/main_testtone.cc
new file mode 100644
index 0000000..bf30ed2
--- /dev/null
+++ b/src/main_testtone.cc
@@ -0,0 +1,51 @@
+#include "daisy_seed.h"
+#include "daisysp.h"
+
+// Use the daisy namespace to prevent having to type
+// daisy:: before all libdaisy functions
+using namespace daisy;
+using namespace daisysp;
+
+// Declare a DaisySeed object called hardware
+DaisySeed hardware;
+Oscillator osc;
+
+void AudioCallback(
+    AudioHandle::InterleavingInputBuffer in,
+    AudioHandle::InterleavingOutputBuffer out,
+    size_t size)
+{
+    float osc_out;
+
+    //Convert floating point knob to midi (0-127)
+    //Then convert midi to freq. in Hz
+    osc.SetFreq(1000);
+
+    //Fill the block with samples
+    for (size_t i = 0; i < size; i += 2) {
+        osc.SetAmp(1.0);
+        osc_out = osc.Process();
+        //Set the left and right outputs
+        out[i] = osc_out;
+        out[i + 1] = osc_out;
+    }
+}
+
+
+int main(void)
+{
+    hardware.Configure();
+    hardware.Init();
+    hardware.SetAudioBlockSize(4);
+
+    float samplerate = hardware.AudioSampleRate();
+
+    osc.Init(samplerate);
+    osc.SetWaveform(osc.WAVE_SIN);
+    osc.SetAmp(1.f);
+    osc.SetFreq(1000);
+
+    hardware.StartAudio(AudioCallback);
+
+    for (;;) {}
+}