X9C503 works with ESP32?

Question

I can't get X9C503 to work with ESP32 but it can with Arduino Mega. 
 What do I need --> To be able to operate the X9C503 to lower the volume of an audio line input. I don't want to use common manual potentiometers. 
 X9C503 Scheme: 
 
 INC__| o o | VCC 
 U/D__| o o | CS 
 RH___| o o | RL 
 GND__| o o | Rwiper 
 
 In my case: 
 INC------| o o | VCC (5v) 
 U/D------| o o | GND 
 Audio in | o o | GND 
 GND------| o o | Salida 
 On Arduino Mega I connect everything directly to the board and the operation is correct. 
 In ESP32 if I connect it to the board it doesn't work, so I have used the 2N3904 diode for the 'INC', 'U/D' pins (I have also tried with 'CS' but Arduino Mega does it well being grounded), and It works but it doesn't do it well, I describe the problem: 
 You have to enter values between 0 and 99, and in general it does it well, for low values the volume goes down and for high values the volume goes up. I detected the problem by always entering the same value. 
 In this case it was '91', if I enter it several times in a row I get different results, normally the volume remains constant but sometimes it goes up, other times it goes down and even total silence occurs 
 With Arduino Mega I enter the '91' 500 times and the The volume never changes, it is constant and its operation is always correct. 
 What could be the problem? What other component can I use? 
 As an alternative, I have tried the FM62429, with ESP32 it works correctly, but it has the amplification function that does not suit me. For the line input I already use 22k&Omega; resistors, then the potentiometer and finally the MSGEQ7, it doesn't make much sense to change a potentiometer to lower the voltage and replace it with a component that can amplify. I can limit the FM62429 by code, for example, to 60% and only use it to lower the volume, although I don't think it is a very elegant solution. 
 Audio Line In -> 22k&Omega; resistors -> X9C503 -> MSGEQ7 Audio Line In -> 22k&Omega; resistors -> FM62429 -> MSGEQ7 
 Any ideas or suggestions? 
 
 [ code ]#include "X9C10X.h" 
 #define CSPIN 33 
 #define INCPIN 14 
 #define UDPIN 27 
 X9C503 pot; 
 
 void setup() { 
 Serial.begin(9600); 
 pot.begin(INCPIN, UDPIN, CSPIN); // pulse, direction, select 
 Serial.println("Introduce un valor entre 1 y 99"); 
 } 
 
 void loop() { 
 if(Serial.available() != 0){ 
 int value = Serial.parseInt(); 
 if (value != 0) { 
 pot.setPosition(value, true); 
 delay(30); 
 Serial.print("Valor introducido: "); 
 Serial.println(value); 
 } 
 } 
 delay(100); 
 }[ /code ]

Ricodora · Answer

I said the 4k7 resistor didn't work when I first assembled it wrong. Now that you've pointed out my mistake......IT HAS WORKED!!! What a great relief! 
 mk you got it right, now if I enter the same value I ALWAYS get the same output 
 So... Whenever I use a transistor to drive an IC at 5V, should I use the 4k7 resistor to ground so that it can take the LOW value? 
 Interestingly I am using the 74HC4051N also with transistors and it works correctly without "the path to ground". Even though in this particular case it is working, should I use "the ground path"? 
 Seems like a basic concept for IC usage, I'm happy 
 I have a multimeter and I take the measurements, which with the little knowledge I have, I consider interesting. I have not shared it due to lack of experience in forums, in solving this type of problem, it has not occurred to me. There were certainly measurements that I did not understand but that an experienced person can interpret perfectly. Next time I'll do it from the beginning 
 Image of the setup that worked:

CODE 
 [ code ] 
 #include "X9C10X.h" 
 #define CSPIN 33 
 #define INCPIN 14 
 #define UDPIN 27 
 X9C503 pot; 
 
 void setup() { 
 Serial.begin(9600); 
 pot.begin(INCPIN, UDPIN, CSPIN); // pulse, direction, select 
 Serial.println("Introduce un valor entre 1 y 99"); 
 } 
 
 void loop() { 
 if(Serial.available() != 0){ 
 int value = Serial.parseInt(); 
 if (value != 0) { 
 pot.setPosition(value, true); 
 delay(30); 
 Serial.print("Value: "); 
 Serial.println(value); 
 } 
 } 
 delay(100); 
 } 
 [ /code ]

X9C503 works with ESP32?

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