First init.

libraries/Adafruit_seesaw_Library/examples/NeoSlider/Dual_NeoSlider/Dual_NeoSlider.ino

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+// SPDX-FileCopyrightText: 2021 Kattni Rembor for Adafruit Industries
+// SPDX-License-Identifier: MIT
+/*
+ * This example shows how read the potentiometer on two I2C QT Slide Potentiometers
+ * and make the NeoPixels change too!
+ */
+
+#include "Adafruit_seesaw.h"
+#include <seesaw_neopixel.h>
+
+#define  DEFAULT_I2C_ADDR 0x30
+#define  ANALOGIN   18
+#define  NEOPIXELOUT 14
+
+Adafruit_seesaw seesaw1;
+Adafruit_seesaw seesaw2;
+seesaw_NeoPixel pixels1 = seesaw_NeoPixel(4, NEOPIXELOUT, NEO_GRB + NEO_KHZ800);
+seesaw_NeoPixel pixels2 = seesaw_NeoPixel(4, NEOPIXELOUT, NEO_GRB + NEO_KHZ800);
+
+void setup() {
+  Serial.begin(115200);
+
+  //while (!Serial) delay(10);   // wait until serial port is opened
+
+  Serial.println(F("Adafruit PID 5295 I2C QT Slide Potentiometer test!"));
+
+  if (!seesaw1.begin(DEFAULT_I2C_ADDR) || !seesaw2.begin(DEFAULT_I2C_ADDR+1)) {
+    Serial.println(F("seesaws not found!"));
+    while(1) delay(10);
+  }
+
+  uint16_t pid;
+  uint8_t year, mon, day;
+
+  seesaw1.getProdDatecode(&pid, &year, &mon, &day);
+  Serial.print("seesaw found PID: ");
+  Serial.print(pid);
+  Serial.print(" datecode: ");
+  Serial.print(2000+year); Serial.print("/");
+  Serial.print(mon); Serial.print("/");
+  Serial.println(day);
+
+  if (pid != 5295) {
+    Serial.println(F("Wrong seesaw PID"));
+    while (1) delay(10);
+  }
+
+  if (!pixels1.begin(DEFAULT_I2C_ADDR) || !pixels2.begin(DEFAULT_I2C_ADDR+1)){
+    Serial.println("seesaw pixels not found!");
+    while(1) delay(10);
+  }
+
+  Serial.println(F("seesaw started OK!"));
+
+  pixels1.setBrightness(255);  // half bright
+  pixels2.setBrightness(255);  // half bright
+  pixels1.show(); // Initialize all pixels to 'off'
+  pixels2.show(); // Initialize all pixels to 'off'
+}
+
+
+
+void loop() {
+  // read the potentiometer
+  uint16_t slide1_val = seesaw1.analogRead(ANALOGIN);
+  uint16_t slide2_val = seesaw2.analogRead(ANALOGIN);
+  Serial.print(slide1_val);
+  Serial.print(", ");
+  Serial.println(slide2_val);
+
+  for (uint8_t i=0; i< pixels1.numPixels(); i++) {
+    pixels1.setPixelColor(i, Wheel(slide1_val / 4));
+    pixels2.setPixelColor(i, Wheel(slide2_val / 4));
+  }
+  pixels1.show();
+  pixels2.show();
+
+  delay(50);
+}
+
+
+
+// Input a value 0 to 255 to get a color value.
+// The colours are a transition r - g - b - back to r.
+uint32_t Wheel(byte WheelPos) {
+  WheelPos = 255 - WheelPos;
+  if(WheelPos < 85) {
+    return seesaw_NeoPixel::Color(255 - WheelPos * 3, 0, WheelPos * 3);
+  }
+  if(WheelPos < 170) {
+    WheelPos -= 85;
+    return seesaw_NeoPixel::Color(0, WheelPos * 3, 255 - WheelPos * 3);
+  }
+  WheelPos -= 170;
+  return seesaw_NeoPixel::Color(WheelPos * 3, 255 - WheelPos * 3, 0);
+}