Donny
The Multipads use "Reverb 1" and "Chorus 2"
DSP's, the PADS will always use which ever type of effect you choose for these two "DSP" blocks(I think you are probably limited to Reverb and/or chorus, check out "Reverb 1 and Chorus 2 on the "eff type" page of the main mixer to see the dsp's available). To activate them you have to ensure that the dsp levels for the pads are turned up on the "effdepth" page of the main mixer.
I hope this makes sense, Paul.