This project explains how we can let our ESP32 play the WAV file. for this project the following sites and files are been used

Free Text to Speech
http://www.fromtexttospeech.com/

HxD
http://www.mh-nexus.de/

Audacity
https://www.audacityteam.org/

Arduino Library
http://www.xtronical.com/

In this project "PAM8403 class D Amplifier" for the amplification of the audio output of ESP32