I think it has no midi ins or outs.But there is aux in.Which keyboard you use??
There is always voicelive touch.You should also check some of Digitech units.
I just picked up older model Digitech Vocalist Workstation EX.
For me it's easiest to use.I need some custom scales and with this I can make them.

Like I said,VL2 is the best processor.I used to have it for two years.It sounds great.Harmonies are good, efx are great.I only wish it was made something like Vocalist worstation with all the keys.It's very easy too use..