DGX 670 pedals

[hayseed]

I am wondering if the Yamaha LP1B 3-Pedal Unit is the only pedal for the 670  I want to gig with my 670 so it will not be in the yamaha stand    Also I would like to know if using the Yamaha LP1B 3-Pedal Unit  can another pedal still be used on the single pedal input to give access to 4 pedals.
The 670 is a beast of a keyboard for weight but it packs a pretty good punch in features. We have one at our church and its great.

Hayseed