Back at E3 last year, I had a few videos of myself trying out one of the Squier prototypes in Rock Band 3 Pro Mode. Now, I’ve never played the guitar before, so this was a completely new experience for me. I tossed the videos up on YouTube along with a brief description of my thoughts. Several thousand views later, I can say that the biggest question I see is whether Rock Band 3 will let you play with your own guitar. Up until this point, I was unaware of any way to play Pro-Guitar/Bass without either the Mustang or Squier Pro Guitars, but it looks like someone has found a solution.
Using some equipment that the average guitar player may not have, including a Roland guitar pickup and an Axon guitar-to-MIDI converter, along with the Rock Band 3 MIDI Pro-Adapter, “WirelessDreamer” created a program for PC/Linux called G2GHPro that can convert the notes played on a normal guitar in real time and send them back to the console to be used in Rock Band 3′s Pro-Guitar/Bass mode.
There are two drawbacks with this method, however. The first is that this method does not show you finger placement on the fretboard the way that the Mustang and Squier guitars do. If you already know how to play, this may not be a major issue, though. The second thing is that a guitar-to-MIDI converter is not an inexpensive unit, and the price of this alone is a few hundred dollars more than the price of a Squier. If you already have your own guitar, know how to play, and have the equipment necessary to accomplish this, it may be a little more enticing than having to purchase another guitar just to play in Rock Band 3, but this solution is probably not for a majority of the community.
In this video here, WirelessDreamer talks about the hardware and setup used to accomplish the task.
If you are interested in downloading the program to try this yourself, you can go to his Sourceforge page here for the Windows and Linux downloads: http://game2midi.sourceforge.net/