I am experiencing the DK bongos problem (Using the GameCube adapter on Wii U, with games on USB hard drive plugged into top rear port, adapter in bottom rear port; DK shows the icon for a standard controller, not bongos, and constantly scrolls to one side as if one bongo were constantly pressed).
Here is my HIDTest v0.6 data with one set of bongos plugged into the first port on the adapter and nothing pressed:
21 10 00 00 01 01 01 02 01 09 00 00 00 00 00 00 00 00 00 00
In a quiet room, the 09 is fluctuating, apparently between 08 and 09. When I clap it spikes, and the first digit briefly goes to 1 or 2.
With a different bongo set plugged in to the first port and nothing pressed:
21 10 00 00 01 01 02 02 01 0B 00 00 00 00 00 00 00 00 00 00
Again, the 0B fluctuates apparently between 0A and 0B, and when I clap it spikes and the first digit goes to 1 or 2.
Anything else I can do to help? Is there a way to get more precise data out of HIDTest, since it changes too fast for me to see exact numbers?