Quick and dirty arduino sketch yields an 8 channel MIDI CC controller for cheap.

knobby_midi.ino

#include <MIDI.h>

#define STROBE 5
#define DATA 6
#define CLK 7
#define RTRN A0

#define MIDI_IN 2
#define MIDI_OUT 3
#define VCV_MODE 4

/////// MIDI CODE 
   #include <SoftwareSerial.h>
   using Transport = MIDI_NAMESPACE::SerialMIDI<SoftwareSerial>;
   int rxPin = 18;
   int txPin = 19;
   SoftwareSerial mySerial = SoftwareSerial(MIDI_IN, MIDI_OUT);
   Transport serialMIDI(mySerial);
   MIDI_NAMESPACE::MidiInterface<Transport> MIDI((Transport&)serialMIDI);
//////

byte addr = 99;

word chval[8];
word deadband = 5;

//byte sr_addr[] = {1, 2, 4, 8, 16, 32, 64, 128};
byte sr_addr[] = {8, 4, 2, 1, 128, 64, 32, 16};
byte midi_ch_map[] = {1, 2, 3, 4, 5, 6, 7, 8};

void setup() {
  // put your setup code here, to run once:
  pinMode(STROBE, OUTPUT);
  pinMode(DATA, OUTPUT);
  pinMode(CLK, OUTPUT);
  pinMode(RTRN, INPUT);
  pinMode(VCV_MODE, INPUT_PULLUP);

  
  Serial.begin(115200);

  digitalWrite(STROBE, HIGH);

  MIDI.begin(addr);
}

unsigned long ts;

void loop() {
  // put your main code here, to run repeatedly:
  MIDI.read();

  if(millis() > ts)
  {
    ts = millis()+50;
    
    for(byte x = 0; x < 8; x++)
    {
  
      digitalWrite(STROBE, LOW);
      shiftOut(DATA, CLK, MSBFIRST, sr_addr[x]);
      digitalWrite(STROBE, HIGH);
      
      delay(5);
      
      word tmp = analogRead(RTRN);
      if(
        (
          chval[x] >= (tmp + deadband) ||
          chval[x] <= (tmp - deadband)
        )
        && (tmp != 0 || (tmp == 0 && chval[x] != 0))
      )
      {
        // send midi message
        byte midival = map(tmp, 0, 974, 0, 127);
        
        Serial.print(millis());
        Serial.print(": CH ");
        Serial.print(x);
        Serial.print(" = ");
        Serial.print(tmp);
        Serial.print(" ala ");
        Serial.println(midival);
        
  
        
  
        //MIDI.sendControlChange(80+midi_ch_map[x], midival, midi_ch_map[x]);
        if(digitalRead(VCV_MODE) == HIGH)
          MIDI.sendControlChange(80, midival, midi_ch_map[x]);
        else
          MIDI.sendControlChange(80 + midi_ch_map[x], midival, 1);
        
      }
      chval[x] = tmp;
      
    }
  }
  
}

Note that it uses shift register and diodes so I can daisy chain a small truck load of pots onto a single analogue in.

Also make sure sr_addr matches up your actual wiring, mine is a dogs breakfast because I screwed up my wiring and couldn't be bothered reworking it 🫠