might not be related but try the tutorial song and check if chords are playing back fine in this arrangement. does it work if you record the chord by playing it on the keyboard? the reason why i'm asking is that sometimes in logic's piano roll editor, a multiple selection can result in only one note sounding at a time - i never really found out why this is.
marc
checked the tutorial song and all the chords are playing fine in there
i did originally record the chords by playing the virus which worked perfectly then edited the midi notes slightly in piano roll and it did work fine for a bit but then after a few plays stopped playing the whole chord
and slightly unrelated but as mentioned before the virus does tend to randomly play notes on its own