Hi, Luth
Yes, you can record just about any keyboard to a br-8. All of them, as far as I know have some type of output jack in the back, whether its a 1/4" jack or an rca type stereo output and the br-8 accepts both. You just have to really watch your levels when recording keyboards because the signal is pretty 'hot' and you can get a lot of distortion.
The br-8 has a separate bank of effects specifically for keyboard, in fact.
Hope that helps!
Larry