Joystick library analog device limits?

Projects Interfacing w/ Software on the Computer
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I’ve recently started using an Adafruit Grand Central as a wired USB game controller with the Joystick library from https://github.com/gdsports/ArduinoJoystickLibrary/tree/samd_patch.

The library has entries for eleven analog devices, but only seven are ever functional. Is this a limitation of Windows, the library, or the Grand Central? I’d like to have at least eight and ten would be even better.

The following code runs on both a Grand Central and ItsyBitsy M0 with the same results:

#include "Joystick.h"

Joystick_ Joystick(JOYSTICK_DEFAULT_REPORT_ID,JOYSTICK_TYPE_MULTI_AXIS,
  5, 0,                   // Button Count, Hat Switch Count
  true, true, true,       // X, Y, Z
  true, true, true,       // Rx, Ry, and Rz
  true, true,             // rudder, throttle
  true, true, true);      // accelerator, brake, steering

void setup() {

  Joystick.setXAxisRange(1000, 2000);  // values correspond to general PPM pulse times in uS
  Joystick.setYAxisRange(1000, 2000);
  Joystick.setZAxisRange(1000, 2000);
  Joystick.setRxAxisRange(1000, 2000);
  Joystick.setRyAxisRange(1000, 2000);
  Joystick.setRzAxisRange(1000, 2000);

  Joystick.setRudderRange(1000, 2000);
  Joystick.setThrottleRange(1000, 2000);
  Joystick.setAcceleratorRange(1000, 2000);
  Joystick.setBrakeRange(1000, 2000);
  Joystick.setSteeringRange(1000, 2000);

  Joystick.begin();
}

void loop() {
  
  Joystick.setXAxis(1500);
  Joystick.setYAxis(1500);
  Joystick.setZAxis(1500);
  Joystick.setRxAxis(1500);
  Joystick.setRyAxis(1500);
  Joystick.setRzAxis(1000);

  Joystick.setRudder(1500);
  Joystick.setThrottle(1500);
  Joystick.setAccelerator(1500);
  Joystick.setBrake(1500);
  Joystick.setSteering(1500);
}

Here’s the result from joy.cpl:

Joystick properties
Joystick properties1000×750 39.1 KB

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