(guitar synth to guitar hero pro) - has full multiplatform support (windows,linux,osx) so Guitar Synthesizers can be used for pro guitar mode in rock band 3. I think some bugs still need to be worked out, so feedback is welcome.
to build the linux source run
./configure && make && make install in the base directory, g2ghpro will be located at src/g2ghpro
OSX
Initial Makefile exists in src directory, once downloaded go to the src directory and type make -f Makefile.osx to build. Hopefully a dmg pkg will be available soon