Do you know those comedy remote control units that make rude noises or say goofy expresions and cost about $10?

Is there ANY WAY to change the sound chip with my own voice prediction or music clip etc etc?

..probably not, if they are similar to the ones that I have seen in birthday cards they are simply one microchip, a speaker, switch and battery. The microchip does all the work and is preprogrammed with the message, music or whatever...

There used to be devices available for recording short messages, and playing them back, which could be adapted, they aren't usually remote controlled, but it would be possible to add a remote control to most of them... They used to be quite popular three or four years ago... I had one that was built into the cap of a ball point pen, but I could never see the point of recording a message while holding something with which you could write it down?!?!