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Just to be clear, are you using only one CYW20706 device which is acting as both A2DP sink and source at same time?
1. No you cannot initialize different audio buffers for both application as our buffers are common for both. You cannot differentiate between the audio samples for both.
2. You can configure the device as I2S master or slave in your application (please check A2DP_sink app implementation) but we have not implemented both sink & source on one device as of now. So unfortunately, we cannot guide you regarding the implementation you are looking for.