In the default implementation of the firmware, the sound files are located into two different folders selected by the "gun switch".

Why not adding a third folder to embed the siren sound of a "Stuka" warbird.

This was an easy modification of the firmware!

now 3 folders :

• 00: motor only sound at various speeds
• 01: motor + siren (at various speeds)
• 02: motor + siren + gun (at various speeds)

Of course you will need to decode the "gun" channel at three states instead of  two to address the right folder. And that's it.

Here is the zip file contaning the sounds : siren sound pack

Firmware is also modified to accomodate both sounds packs. to select siren use a serial link to your ESP32 and type this command:

• SIR=1 (or Sir=1 or sir=1) to activate the siren option
• SIR=0 (or Sir=0 or sir=0) to desactivate the siren option and stay with "motor+gun" files