based upon what I'm reading here, it does seem to indicate that a rewrite of the emulator would be needed to support guitar functionality. As well as it was discussed that you would most likely have to test and record output from the ps2 guitar to find out exactly how it was communicating as per the differences in fret buttons on the guitar and a regular gamepad.
I always suspected that it was something like this; a case of the emulator designed to only work with specific emulated hardware input. (A gamepad rather than multitap or guitar as stated)
That's not to say that it can't be done, but at this point it looks like whomever attempts this would have much more work than they bargianed for ahead of them.
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