Hi Moe, ksj
I'm really struggling with one unexpected issue...I hope you have some idea
Basically I have Adafruit in the gauntlet and everything always worked fine, I was able to play sounds via buttons in the gauntlet and so on.
At that time power for Adafruit was coming to micro USB port, ground from Arduino GND pin and everything worked without any issues (see video below)
Then I assembled everything via wiring and basically buttons are not working anymore...
This is what I have now in the gauntlet (exactly the same as per video above, no changes) except the battery pack which is providing power instead of micro USB
View attachment 1739546
and of course ground is coming from Arduino via RJ45 (from Arduino to the board, from the board to RJ45 (both Gauntlet and Head)
The main difference I see is that your buttons look like they are sharing ground with power coming in (picture is not showing all wiring).
Mine is isolated from the power coming in kind of like what adafruit did.
I also grounded the GND pin next to ACT in the corner where you have it by itself not directly grounded to the buttons.
My money is on if you isolate ground and power from the rest of the buttons grounds like adafruit did, you may get better results.
Maybe also gheck the voltage you are getting at the Vin/Gnd next to the USB.