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You can refer to the "ble_wifi_introducer" application in the demo folder. Basically the same BT API's that you would use for the CYW20706 BT device should work even for CYW20707. Just that CYW20706 has an integrated Host MCU and your case the CYW43907 will act as the Host MCU for the CYW20707 over an UART HCI interface.
For the audio examples, you can refer to the Apollo, Audio Loop back apps in the demo folder.