Here is a solution for a good and realistic hammond sound.
You need an iPad/iPhone with the apps "VB3m" and "MKSensation xtreme".
"VB3m" is a hammond app, "MKSensation xtreme" a sound module with effects and master keyboard functions (splits, volume....).
By the way, I also use also the Wurli and Rhodes from "MKSensation xtreme" because for me it sounds better than the px S3100 ones.
This way, I can save registrations with splits (Px S3100 with iPad ) or a registration with volume off when I only want to use the iPad hammond/rhodes/wurly. The leslie effect start fast, when I press the sustain pedal but you could use also the pitchbend or the knobs. The output of the iPad could go to the audio in of the px S3100 or to a mixer.