As Didier should be able to play song and speak load enough to able to play in the street
There is shure audio recever, so I can speak for the robot, it is wired with an octaver pitch so I can make a more robotic voice
I first took the audio part from a LD system :
A small audio mixer
i currently have a lot of noise problem, it seems to come from the raspberry.
It is probably to ground problems from power or usb inputs