I'm not too sure that any keyboard with out a mod wheel would have modulation features; thats the whole purpose of a mod wheel!
I have a psr290 and it has no mod wheel and no features for pitch bending, i'm guessing its not too far off your model.
Any pitch bending u do to any sounds from the keyboard would have to be done with some form of software or external hardware, like an effects processor.
Hope that was helpful!
Kramit