Roland SPD-SX PRO Sampling Pad with 32GB Internal Memory - Manual (Page 36)

Playing
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7. Configure the wave you want to play, the volume and so on.
You can use an external pad or footswitch to assign functions aside from playing sounds, like switching between kits or turning
kit effects on/off.
Configuring the Functions to Assign to the Pads and Footswitch, and Configuring the PAD EDIT Knob and Expression Pedal
Settings for the SPD-SX PRO Overall (CONTROL SETUP) (P.111)