Each argument is accessed by a MIDI controller. Camera eyeX,Y,Z control

Processing Libraries
1

I’m trying to control the camera view using a MIDI controller.
For each knob, we want to control it by attaching it to X, Y, and Z.
But when I do X,Y,Z control in my code, when I touch the X knob, other knobs such as Y,Z are converted to initial values.

We want the initial value to always be stored as the last value.

I want to know an example of how to modify what part.

Regards.

import themidibus.*;
MidiBus myBus;

int ccChannel;
int ccNumber;
int ccValue;

void setup() {
  size(400, 400, P3D);
  //background(0);
  MidiBus.list();
  myBus = new MidiBus(this, 0, 1); 
  
  
}

void draw() {
  //model
  noStroke();
  background(0);
  lights();
  translate(0, height/2, -height/2);
  fill(153);
  box(50);
  translate(width, 0.0);
  fill(255);
  sphere(50);
  
  //camera
  camera(ctlX(), ctlY(), ctlZ(),// eye, eyeY, eyeZ
  0.0, 0.0, 0.0, //centerX, centerT, centerZ
  0.0, 1.0, 0.0);//upX, upY, upZ)

println(ctlX(), ctlY(), ctlZ());

}

void controllerChange(int channel, int number, int value) {
  ccChannel = channel;
  ccNumber = number;
  ccValue = value;
  println("channel " + channel, "number " + number, "value " + value);
}


float ctlX() {
  float x = 0.1;
  if (ccNumber == 16) {
  x = map(ccValue, 0, 127, 0.0, 200.0);
  } 
   return x;
}
float ctlY() {
  float y = 0.1;
  if (ccNumber == 17) {
  y = map(ccValue, 0, 127, 0.0, 200.0);
  } 
   return y;
}

float ctlZ() {
  float z = 0.1;
  if (ccNumber == 18) {
  z = map(ccValue, 0, 127, 0.0, 800.0);
  } 
   return z;

}
2

Pseudo-code:

float ctlY() {
  float y = 0.1;
  if (ccNumber == 17) {

  if(y==0) {
   return oldValuey; 
  } else {
  y = map(ccValue, 0, 127, 0.0, 200.0);
  oldValuey=y; 
  }

  } 
   return y;
}