What hardware are you using to play the audio file? The Arduino doesn't know squat about audio files.
I have the audio file in the sd card and using the library GitHub - TMRh20/TMRpcm: Arduino library for asynchronous playback of PCM/WAV files direct from SD card. Arduino Uno,Nano,Mega etc supported , I am able to play the audio file on a speaker which is connected to the pin 9 of arduino promini.
I was wondering if its even possible to play the audio file from the sd card ( whenever the data point exceeds a certain value) while continuously writing the sensor data to the card.