Chip Identification in Push Button Toy

I have a toy that simply consists of a button which plays a variety of phrases when activated. My intention is to replace the sounds with my own. However, I have been unable to identify the chip and therefore cannot interface with it.

Here is a picture and schematic of the board, developed using a multimeter in continuity mode.

Here is a closeup of the chip.

I believe the markings are as follows:

JFK8-4
P04003

There is also a "triforce" logo, for a company which I have not identified yet.

Pins 1 and 8 are particularly interesting, as they are not connected to anything. I assume they were used to program the chip, but am not able to identify a protocol if any exists.

It would be appreciated if anyone can locate a datasheet. I would also be happy with advice on identifying the function of the unconnected pins.