Hi Samson,
some (Preset) Multi Pads contain a "Chorus Send Level" event (= control 93), but many other Pads do NOT.
Please make sure (in Multi Pad Creator / tab "Edit") that there exists a "Control 93" event. (If not, you have to create one.) Then you can adjust the depth of the effect by changing the value of this event.
After that, you can also change the value of "Chorus Return Level" in the Mixing Console (Standard value is "64" here.
All possible Effect Types for the System Effect block "CHORUS" are listed in the Data List book of your Keyboard model.
Hope this helps!
P. S.
To my knowledge, it is NOT possible to use DSP 1 ("Variation effect") with Multi Pads.
And, of course, the Reverb and Chorus effect blocks can ONLY be used with MIDI Multi Pads (but NOT with Audio Link Multi Pads).
Best regards,
Chris