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  1. Hi... If you have to do complex operations to prepare the sound data, 23 ms may be not much. Additionally there may be some overhead to handle the DMA interrupt at the end of the transmission of each sound buffer and to manage the data cache, which is required to ensure, the sound data can be written out using DMA. Unfortunately I cannot specify, how much overhead this will take, without doing complex measurements, but I guess it will be not more than a few milliseconds. printed circuit board