As far as I know, this is the first replacement speech board ever made for the VSU-100.
The VSU-2 recreates functionally of most of the logic ICs and the hard to find speech chip with a microcontroller, and there are a few extra bells and whistles like volume control, led indication, test button, and a serial programming interface.
Mounting holes and pin headers are identical, so it should be a drop in replacement for most people.
The audio output is nearly identical to the original, and does not need as much filtering so it is a little easier to understand.
More images, and an audio comparison is on our website: https://glodstone.com
It's listed in our pinside shop for $125: https://pinside.com/pinball/market/shops/1297-glodstone/04572-vsu-2