i could use a second letter, but that's twice as much work as one letter. for example the if the rhythm guitarist's name is bob i would set his guitar to "b" and his vocal to "b2", and then only have to remember B for bob and can easily turn on and off his groups with 100% laziness.. i mean.. effectiveness
also there is only 1 "b" on the keyboard, but there are separate groups for mixing and editing.. you can't use "b" for both.. i think this was probably the reason for there being 4 groups of each letter.
im thinking maybe i'll just open up a blank session and bang on the keyboard until "2k" lights up