Espressif Audio Development Framework provides a rich functional SDK that works more and more stable with each release. Not without its jambs, of course. She also has disadvantages. For example, some libraries are provided without source codes. There was no version in the line of boards using an internal DAC and ADC for audio processing. Of course, for something serious, this approach will not work. And the capacity of the built-in ADC is 12 bits and the DAC is 8 bits imposes some restrictions. Yes, and these built-in modules are not weak. But I wanted to try to make, if not a VoIP phone, then try to run the example of Google Translator and Text-To-Speech