Sometimes it is quite useful to be able to generate a test tone. We can use the GeneratedSoundStream class together with a SoundGenerator class. In my example I use a SineWaveGenerator.
In order to make sure that we use a consistent data type in the sound processing I also used a typedef int16_t sound_t;. You could experiment with some other data types.
To be able to verify the result I used CsvStream<sound_t> printer(Serial, channels); which generates CSV output and sends it to Serial.
Here is the result on the Arduino Serial Plotter:
