- most were trivial
- missing group close or open
- extra space
- no doxygen comment
- name commad might open an implicit group
this hould also be implicit cosed but does not happen somtimes
- crazy: internal declared groups have to be closed internal
This adds an API function to play a buffer of Audio samples using a DAC.
Double buffered operation is supported by specifying a callback that will
be called when the next buffer can be queued with dac_dds_play().
