I'm completely out of ideas and the issue very well could have been discussed at some point.
I dl'ed the RS2014-Mod-Installer.exe, ran it. The game started up normally. When it came time to tune my guitar the message kept stating that my cable was unplugged but it was, I see it in my device manager and doesn't have any errors. I uninstalled RS2014, rebooted, the cable shows in the Device Manager. Start the game, everything is looking normal. Same issue persists, it keeps stating that my cable is unplugged when it isn't. Tried connecting one of my other guitars, nothing. Tried changing USB ports, nothing. The last resort would be to reformat but I think that'd be overkill.
If anyone has had a similar issue and a fix, please advise! Any and all help is greatly appreciated.