If only there was a way to remotely trigger them--I've got a couple of toy-grade (around 1/32 scale) radio controlled buses that I'm thinking of modifying to hobby-grade steering and speed control, and wirelessly-triggered sound effects (even if from a separate controller) would make them rather interesting novelties.
---PCJ
With $1-2 of components, I think you can modify the same toy-grade remotes you have to activate 4 separate sounds. Most, if not all, of the thousands of different $10 RC toys have the same Fwd-Rev, Left-Right electronics...in other words 4 separate functions. I'm using such a RC module to control my version of the Wienermobile.
I'd suggest taking the receiver and modifying it to activate up to 4 separate sound modules or to select from (up to) 4 sounds from a multi-sound module that uses 4 buttons to select the sound. If you want to pursue this, start a thread on the Electronics forum and I'll make some comments...
