Programming audio to a voice ROM
Here is a datasheet.
You cannot re-program this device- it is one-time programmable only. This was a magnificent improvement from the mask-programmed parts we had to source prior to OTP EPROM availability, at least for prototypes and small quantities. The mask-programmed parts had a large minimum order quantity, significant lead time, and mask charges, and if you got it wrong there was no recourse other than discarding the parts and starting over.
You could buy another chip and program it, but you would probably have to source the programmer that the manufacturer sold for it (and being 22 years old, they're likely a bit hard to source). I doubt they made the programming information public.
I see some NOS chips identical to yours (note: it is not a sure thing that they are not already programmed with something and thus useless to you) and some used programmers available from China for about $100, but they're for a slightly newer version of the chips and not listed as compatible. They would also probably require XP or some earlier O/S such as Windows 98.
The manufacturer APLUS (a fabless Taiwan company) still exists. Here is their website.