The following is a list of functions that can be controlled by using external footswitches connected to the SPD-SX:
- Kit Increment (INC) - Selects the next Kit
- Kit Decrement (DEC) - Selects the previous Kit
- CLICK On/Off - Turns the CLICK On or Off
- TAP TEMPO - Sets the tempo from tap input
- ALL SOUND OFF - Stops all currently playing sounds
- FX1 ON/OFF - Turns FX 1 On or Off
- FX2 ON/OFF - Turns FX 2 On or Off
- PAD CHECK - Turns the PAD CHECK feature on/off. (Allows you to hear the selected sound from a pad through the headphones output without having the signal be heard through the main outputs).