do you guys really want eventide, famous for crazy delays, harmonizers, reverbs, mod etc effect, to create a simple digital distortion? there are lot of different, great pedals, analog, tube, solidstate if then something like multi band distortion or something crazy with pitch shifting combination for different EQ bands.
I think it was explained few times, that more presets at a time is impossible due HW limitations and complexity of effects. Rather keep going suggestions for more complex effects, that may have combination of effects that you want to use at once – lot of eventide effects are done in this way
regarding master/slave presets – this can be easily done via Midi just program one (master) H9 to trigger preset on second H9 using PC message when you call presets on the master H9
