Set the waveform of the given audio channel.
channel- The oscillator channel (0-3).
waveform- Index of waveform to use.
This command returns no values.
You can load one of the following waveforms.
The Sample waveform is a 512B block of audio data, enough for one cycle. Call
audio.SetSample with the address of a sample to load it. Only one sample can be used at a time.
A collection of ready-made samples can be found in the
/media/samples/ folder of the SDK.