- *
- * On start-up the system will automatically enumerate and function
- * as a USB microphone. Incoming audio from the ADC channel 1 will
- * be sampled and sent to the host computer.
- *
- * To use, connect a microphone to the ADC channel 1.
- *
+ *
+ * On start-up the system will automatically enumerate and function as a
+ * USB microphone. By default, the demo will produce a square wave test tone
+ * when the board button is pressed. If USE_TEST_TONE is not defined in the
+ * project makefile, incoming audio from the ADC channel 1 will be sampled
+ * and sent to the host computer instead.
+ *
+ * When in microphone mode, connect a microphone to the ADC channel 2.
+ *