zizzle zoundz toy..

[calculus]

hi this is my first post on the forum, however i have done a fair bit of cicuit bending already...

i have a zizzle zoundz toy... i am aware that you can easily hack a output on it... but it's a digital chip based toy... so given that it can record on to one of the pieces already is it possible to reprogram the chip for your own sounds more of a hacking question than a circuit bending one.  Has anybody looked into these seriously. they're affordable and fun but limited. I know people used to hack those singing fish billy bass thingies with thier own tunes so why not this?