Are we limited to 9 faders ? Of course we can use arrows but it is not as we can have faders. In fact, if we can decide the number we want, that would be the best...i think.
The faders are limited to 9. You can have as many subs as you want. You do not have to use faders to control subs either through MIDI or OSC. You can map an external control to any sub using the Setup window's OSC or MIDI tabs.