So, I was curious, can I sync this controller dongle (that little thing, not the guitar itself):
with this guitar? .
I want to play Frets on Fire with this guitar on the PC with this set but I can't sync them.
I had a similar issue a while back when I moved house and had a few different GH controllers and it was hell trying to find which dongle went with what guitar. So basically, you can't do it.
A GH dongle will only sync to the type of guitar controller it's made for, at least in my own experiences.
I would recommend you to use "Xpadder", it is a software that detects all the buttons of a projection device or hardware, then asignas to each button found a key on the keyboard (obviously). In any case, there are many tutorials to configure XPADDER on Youtube. I see you use it for the PC game called FoF, as I explain a bit why is not supported when using both guitars. You see, the first image samples is the GHWT guitar and the second is that of GH3. You see, not is if you asked (if is played GH on PS2 ever without guitar) of the "why do I in GHWT is not supported without the guitar?" i.e. can not play the game without the guitar as well as the GH3 or its predecessors. It is simple, this is due to changes in terms or actions for each button of the guitar, I mean, GH3 guitar is supposed that "Green" is "L2", "Red" is "L1", "Yellow" is "R1", "Blue" is "R2" and "Orange" is "▲". But this changes on the GHWT guitars since its keys are different actions.