Hi, thanks for the reply.
It solved some parts of my issue. But I also want to set loop times of audio.loop().
For instance, if I set
audio.connecttohost(tts.getSpeechUrl("Hello, World!").c_str());
I want to hear "Hello, World! once until I set another word to connecthost function.
I figure out ...

I have been learning how to program in esp32 using arduino IDE.

I couldn't figure out how to use max98357a board with Esp32-DevKitC. I have tried "Audio.h" and "AudioTools.h" libraries but not is changed.

My first attempt was just testing voice output. My code is below:

#include "Arduino.h ...