(1) you need to refer to the following application circuit about the Aux-in (LINEIN-R and LINEIN-L) input. Please ignore the ADkey connection here.

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(2) And referring to the below, send the serial command 7E 04 D3 02 D9 7E to choose the recording mode:

(3) Then referring to below send a serial command to make a new recording:

(4) Or send the command like below to make a new recording with a file name.