Unfortunately the available memory on Microcontrollers is quite restricted and we do not get very far by storing a (uncompressed) WAV file e.g. in program/flesh memory, so I started to look into ...

The RA4M1-Zero works with the Arduino IDE, making it easy for developers to get started ... All other documentation, including schematics, firmware, flashing tool, and datasheets, can be found on the ...

NOTE: it turned out to be very important to connect GND of both esp32 (just connecting them via USB to the same Computer is not enough!) ...