Thanks, glad you both like it
Just had a listen to the TI Computer Fun recording on your main site, not sure it's identical but sounds a bit similar yeah!
I've found I get very similar glitches out of a few of the speaking VTechs - the blue-backed Alphabet Desk and the Little Smart Answering Machine for two. Also did a Grandstand IQ Builders Talking Computer which had similar stuff going on.
(Can hear that one at
http://youtu.be/C_sEQHNFDsU)
I'm thinking the basic concept for making 'standard coil-clocked speaking toy with separate sample ROM chip' is fairly similar all round, so it glitches out in a similar way. Well, there's likely to be a few approaches, but one of them was used quite often in the 80s and 90s.
Though curiosity got the better of me and I had to open it up to check, but both of the ICs are VTech branded, and can't find any info on them.