first of all:
the GIMX software version: 3.5
the OS: Windows 7 64bits
the adapter: DIY USB adapter (picture below)
the console: Xbox 360
the game: xbox dashboard
the controller: Xbox 360 controller
Teensy: teensy 2.0
I am trying to record my input on the xbox 360 controller while I play a game on the xbox 360. I think I could achieve this with GIMX.
I have the DIY adapter set up as explained in the tutorial for dummies. However, note that the Serial converter is not the same type as used there (so the wiring could be wrong). I use it in combination with a teensy 2.0.
I installed the firmware (EMU360/ atmega32u4.hex) on the teensy and got the serial adapter working (I tested this).

Just in case:
GND - GND
RXD - D3
TXD - D2
(I tried rewiring RXD and TXD, but that results in the 'no controller found' error)
So now, I can plug in my xbox 360 controller into the PC (Driver: xusb21) and plug in the DIY adapter (into PC and console) and then I turn on my console. I then start the GIMX-launcher, select the Windows_X360PadUsbXinput.xml config ( it says it is OK when I test it) and click start. In the GUI or Terminal window I can see my input on the controller being registered. However, the Xbox does not respond to my input,so I am still doing something wrong. Perhaps it is the order in which things are plugged in?
Any help is appreciated!