Analog input stability

Other Hardware Sensors
7

I need this for 12 bit res, for the digital encoder the readings are stable, but when analog in is on ±1,2 variations appearing
This is the part:

#include <Encoder.h>
Encoder enc2(3, 4);

void setup(){
Serial.begin(9600);
}

void loop(){
float frqA;
const int threshold = 200; //
int analogValue = analogRead(A0);
 
if (analogValue > threshold) {
  frqA = map(analogRead(A0), 0, 4095, 0, 4092);
  } 
  else 
  {
  int val1 = enc2.read(); //freqA of Wavetable **0 -> 2^32
  if(val1 <= 0) { // constrain for below 0
  enc2.write(0); // constrain the encoder object
  }
     else if(val1 >= 1000){
     enc2.write(1000); 
     }
     frqA = constrain(val1,0.1,1000.00)*4.092; // (=1x..hz..) 
  }

  Serial.print(" freqA:");
  Serial.print(frqA);
}

What do you think?