How can I record over an existing sound chip?
I get several birthday cards or little toys that have sound chips inside with a prerecorded message. The board looks simple but I can't figure out out to re-record my own sound onto it. Most of them have a big black plastic dot over (something). Does this make it impossible to get to the actual chip/program? (Yes, I know I could BUY one -- I want to repurpose the several I have).