Joystick controlled Geckodrive 213 issues.

Hello everyone. I am attempting to control a stepper motors speed and direction, using a joystick, driven with a Geckodrive G213V.

The Geckodrive is driven simply by 2 pins. STEP and DIRECTION. I think I have that down.

But it won’t respond quite like it should. I have direction control but I can’t vary the speed. I have looked into changing the pwm frequency, but
everything I did resulted in no change. When I reach the upper/lower value of the joystick the motor stops turning.
I have modified the code from an earlier project, but when I take values from a multimeter on the pins, it appears to work just like it should.
I must be overlooking something.

The code:

//motor pins and reverse

const int XMPin     = 11 ;
const int XPin     = 3 ;
const int YMPin      = 9 ;
const int YPin      = 10 ;

// pointometers/joystick

int joyx     = A0 ;
int joyy     = A1 ;


// variables
int Xval   = 0 ;
int Yval   = 0 ;



/////////////////////////////////////////////////////////////////////////////////////

void setup() {

Serial.begin(9600);

pinMode (XMPin, OUTPUT);                         
pinMode (XPin, OUTPUT);                            
pinMode (YMPin, OUTPUT);                           
pinMode (YPin, OUTPUT);                           
}

/////////////////////////////////////////////////////////////////////////////////////

void loop()
{
Xval = analogRead(joyx);
if(Xval < 480)
{
   Xval = map(Xval, 480, 1, 0, 255);
   analogWrite (XPin, constrain (Xval, 0, 255));
   digitalWrite (XMPin, HIGH);
}
if(Xval > 542)
{
   Xval = map(Xval, 542, 1023, 0, 255);
   analogWrite(XPin, constrain (Xval, 0, 255));
   digitalWrite (XMPin, LOW);
}
{
Yval = analogRead(joyy); 
if(Yval < 480)
{
   Yval = map(Yval, 480, 1, 0, 255);
   analogWrite (YPin, constrain (Yval, 0, 255));
   digitalWrite (YMPin, LOW);
}
if(Yval > 542)
{
   Yval = map(Yval, 542, 1023, 0, 255);
   analogWrite(YPin, constrain (Yval, 0, 255));  
   digitalWrite (YMPin, HIGH);
}
}
}

Here is a video of what is happening.

Any help is appreciated
Thanks

Nick B.