// This code is made on the fly. It is not tested and I suspect you will need to limit it to only sent a 'b'. Sorry time to sleep. Latter I could improved it if you run in trouble.

float AxisRDRX;
float AxisRDRY;

 int EventHandle(int type, alias o, int x)
  {
   
   if ((&o == &HCougar) & ((x == RDR_X) | (x == RDR_Y))) // Isolate the event. 
    {
     AxisRDRX = HCougar[RDR_X]; // Get the axis value;
     AxisRDRY = HCougar[RDR_Y]; // Get the axis value;
       
     if (AxisRDRX < XXXX) // You must test which axis value corresponds here). 
                          // The idea is detect that the axis is not pushed. I assume the axis goes from 0 to a positive value.
      {
       if (AxisRDRY > XXXX) // If the other pedal is pushed.
        {
         ActKey(PULSE+KEYON+'b');
        }
      }

     if (AxisRDRY < XXXX) // The same but interchanging axis. 
      {
       if (AxisRDRX > XXXX) // If the other pedal is pushed.
        {
         ActKey(PULSE+KEYON+'b');
        }
      }

   DefaultMapping(&o, x);
  }