Sorry to dig this old thread out, but just to let you know that I've taken the plunge. I know it's expensive, but it solves a problem I've personally had with my Tommy.
I love the game but just hate the stage-show songs. What this little board allows me to do is to replace all of the songs in the game with real WHO songs, whilst leaving all other sounds and call outs the same.
And as someone has already done all the work for me for a Tommy (checkout the pinsound.org website), I only need to take their file and fine tune it to my own taste.
Fantastic.
I've pre-ordered and can't wait to try it out!
All the best.
Goz