A:AnswerIf the guitars needed a usb dongle to work on the Xbox one then no it won't let you connect them to a PC. If the guitar connected directly to the Xbox one wirelessly without an extra dongle then yes it will work on PC.
I can't remember if the guitar hero or Rockband guitars used a dongle to connect but I know one of them did and that one won't work with anything but the dongle that came with it.
A:AnswerYes, you can connect 8 Xbox capable devices. But these dongles have serious sound quality transmission issues that Microsoft refuses to address after years. You are best left connecting you audio output device direct to your PC by other means.
A:AnswerIf the guitar needed a dongle to connect to an Xbox one then no this won't help.
You would need that original dongle or to contact whoever made the game/guitar's support people.
If the guitar connected to an Xbox one (and beyond) wirelessly with no extra dongle then yes it will work and let you connect that same guitar to PC.
A:AnswerIf something requires a dongle then no. Anything that uses a dongle isn't using the Xbox wireless protocol. If it were it wouldn't need a dongle.
Only place to get a replacement now is probably eBay. They stopped making those guitars and accessories for them not long after the game launched. You can always contact Activision support to double check but it's doubtful they would have any left.
