Which accessories are compatible with Access controllers?
Third-party buttons, switches, and other devices that are compatible with a 3.5mm port can be plugged into your controller’s expansion ports to add more mapping options. From the left, the ports are located in this order: E1, E2, E3, and E4.
A) Expansion ports
When inserting a compatible accessory into an expansion port on your controller, make sure you fully insert the jack into the port.
For information about commercially available device compatibility and use, check the instructions included with your device. Not all devices work with your controller.