Alarm with 4 voices recorded messages

I have made a 4 voices alarm system to add to my 4CHPro SonOff device.
So, I am being alerted by one of the 4 voice messages.
I use 4 X ISD1820 voice recorder modules and an 1 X audio amplifier PAM8403 module for a louder sound.
You can find my shematic diagram by cliking HERE