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The module itself is very good. It has an UART which makes it possible to integrate the module into other systems using AT commands. However the audio output is differential (the audio ground is not power ground!), this is used to make the output less noisy, but it requires an amp which supports this input or need a circuit which turns it into a balanced audio out. The DAC has a really noticable amount of noise, it is possible to make it less noticable by filtering the output, but it doesn't go away.
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