using sustain for split voices

[ryvoke]

I just bought a YPG-235. I am messing around with the split feature, and I am not able to figure out how to use the sustain pedal for the voice on the left of the split. When I use the sustain pedal, the voice on the right of the split is sustained, but not the voice on the left.

Does anyone know how this is accomplished?

Thanks,

Ryan