Ideas/ design needed for sound system on a childrens bed

[Jez]

Hey there, I am a carpenter who has built his 3 yr old a truck bed from scratch, 100+ hrs and counting. I want to put a sound system in it that will comprise of 7 input lines from various micro switches placed under pedals etc, I want these switches to in turn give individual sounds ( brakes, air horns, startup from key etc) to which will run to a pair of speakers hidden in the exhaust stacks. As one sound is playing and another is activated the second must be able to override the first, and if a switch is repeatedly pushed the sound must cycle back to the start with each push. The sounds will be between 3 and 5 seconds long and will be in a mp3 format. The truck already is wired for 12 volt to run the extensive lighting circuits already in place so power isn't a issue, he has a small electronic train with several buttons on it that produce individual sounds, is there any way of altering the circuitry to suit my application or is this a case of a brand new design, I have a limited knowledge of electronics so any help or ideas to achieve my goal would be appreciated.

 

[djsfantasi]

I just saw this device last week. Take a look at it - it doesn't do excactly what you want (5 sounds instead of 7, repeat pressing of same switch will stop/start individual sounds but will override other sounds as you desire) but if you can compromise, it might be a good fit. **broken link removed**

 

[Jez]

Thanks for the link, looks good though definitely need the seven separate inputs, are they able to be altered? Does any one know a company or individual who is able to make a one off to suit what's required?
Many thanks Jez

 

[KJ6EAD]

Model railroad sets have similar requirements. You might find something in that genre.