Nope. Magma won’t allow them because the game engine doesn’t. If you bypass Magma, it doesn’t work in game either. I forget how it displays them, but it doesn’t work on guitar/bass like it does on keys.

Pretty sure if you bypass it will cut off the first sustain and chart the second note as normal IIRC.

I do wish this was something added into RB as it was in GH (ie, Santeria). I can see how some people may use it wrong, but it would making charting out acustic guitar chords a LOT better looking/feeling (I’m looking at you Freebird with those awkward G,Y,GYB or whatever in the beginning).