It really stood out to me in the original recording too. So much so that I dug out my SE and ran Tetris on it to verify. I noticed you were running System 7 and I wonder if there's a background task causing the stuttering.
On my SE with 2.5 megs of memory, running System 6.0.8 without Multi...
I haven't tried it, but it looks like the app Now Hear This might be able to open System 7 sound files in System 6. https://macintoshgarden.org/apps/now-hear
Here's what i was able to trace out.
External Pin (facing connector)
Color
Internal Pin (from top of card)
5
Orange
2
4
Red
4
3
Black
5
1
Clear (bundled with Black)
8
2
Black (bundled with Clear)
9
I'm not sure what the functions of each pin are. I can guess that the...
I have an SE/30 Full Page Display board that i haven't gotten to work yet, but it did come with the external connector bracket. Does you ribbon cable and connector look like this?
Let me see if i can trace the wires...
I have one that is bent in the exact same way. One is straight, the other bent. Was thinking about heating it up and gently bending it back. Or, if it snaps off, using epoxy to reattach in the right position.
This is such a cool project. My SE and I are looking forward to it as well. It would be cute to make a little badge that fits in the front panel like the old contemporary accelerators did.