have you got a link to the micro sd project ?that's the one,someone in the usa has made a board that uses a microsd and wav files to replace the tms chip,and @myPinballs does the remade boards with original chip in the uk
We have just got one of these. The voices currently sound fuzzier than our original board so we’re troubleshooting with the guy who makes the boards (who is very responsive and helpful).https://geeteoh.com/geeteoh/default.shtml
there you go Alan,I put one in my flash gordon to add custom sounds