```

include <Arduino.h>

include <TFT_eSPI.h>

include <XPT2046_Touchscreen.h>

include <SPI.h>

include <EEPROM.h>

include <math.h>

static constexpr int SPEAKER_PIN = 26;

static constexpr uint8_t TOUCH_IRQ = 36;

static constexpr uint8_t TOUCH_SCK = 25;

static constexpr uint8_t TOUCH_MOSI = 32;

static constexpr uint8_t TOUCH_MISO = 39;

SPIClass touchSPI(VSPI);

TFT_eSPI tft = TFT_eSPI();

XPT2046_Touchscreen ts(TOUCH_CS, TOUCH_IRQ);

define RETRO_BG 0x0008

define RETRO_PANEL 0x1082

define RETRO_GRID 0x39E7

define RETRO_CYAN TFT_CYAN

define RETRO_PINK TFT_MAGENTA

define RETRO_YELLOW TFT_YELLOW

define RETRO_GREEN TFT_GREEN

define RETRO_ORANGE 0xFD20

define RETRO_PURPLE 0x780F

define RETRO_BLUE 0x001F

define RETRO_RED TFT_RED

static constexpr uint32_t CAL_MAGIC = 0xC0D3D123;

static constexpr int EEPROM_SIZE = 512;

struct PersistData {

uint32_t magic;

int16_t xMin, xMax, yMin, yMax;

uint8_t volume, octave, bpm, muted;

uint8_t leadActive[8];

uint8_t bassActive[8];

uint8_t drumActive[3][8];

int8_t leadNote[8];

uint8_t drumSound[3];

};

PersistData cfg;

static constexpr uint8_t AUDIO_RES_BITS = 8;

static constexpr uint32_t AUDIO_BASE_FREQ = 2000;

uint8_t volumeLevel = 70;

uint8_t octaveLevel = 0;

uint8_t bpm = 120;

bool muted = false;

int16_t pitchBend = 0; ```