After realizing that Arduino has spread all around, despite the fact that i am a PIC man myself, but still i decided to give it a go, and start working on implement it with some of the projects i normally build. 
So intention is to develop a way of introducing an LCD, and interface control with the Arduino, and if not enough with the Atmel itself...
Intention is to have a nice graphic display of volume, specific relevant controls, etc, all through it...
So we wuld end up with an analog siren with top notch digital complements that would make them a few steps further in quality and number of sounds and features that a siren ( with or without delay) can offer...
All to make soundsystems, and DJ's armed with up-to-date sound gear.
Gonna take a while to develop the code, experiment etc, but im sure ill love it all the way !!
BOOOM !!!

PS-also seriously thinking of making DIY kits available soon, at least for some of the more basic builds, for those who want to build their own sirens, but dont have much knowledge to do it on their own...

So with nice tutorials, professional built PCB's, and the kit with necessary components, anyone with a steady hand and a bit of patient will be able to do it !!

If anyone has any ideas or opinions they would like to share in this field/question please let me know !!!