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can you replace the 'audio byte' that is stored in a pre-recorded musical greeting card? Answered

The card I have has 2 unused solder plates.

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I actually found a third plate just above the left hand battery.

I would regretfully say that most signs point to no. Regardless of whatever chip is hidden under that blob of gunk, most likely they'll have used a one-time programmable chip, or set the fuses to be read only. However, that doesn't stop you from making your own circuit :D

yeah - its likely cheaper for the builder to use a one time programmable rom for the sound, then seal it all up in epoxy.