How to make MPR121 play with FastLED

MPR121+FastLED.cpp

Adafruit_MPR121 _cap;
uint16_t _currButtonState;
uint16_t _lastButtonState;

bool isPressed(int button) {
    uint16_t bitmask = 1 << button;
    return !(_lastButtonState & bitmask) && (_currButtonState & bitmask);
}

void setup() { // or the top of `int main()` -- however you're writing it
    _cap.begin(0x5A); // I left the address pins open, so it's 0x5A
    
    FastLED.addLeds<blahblah>(blah);
    // etc
}

void loop() { // or the infinite loop in `int main()` -- again, however you're writing it

    _lastButtonState = _currButtonState;
    _currButtonState = _cap.touched();
    
    if (isPressed(2)) {
        // React
    }
    else if (isPressed(0)) {
        // React differently
    }
    
    // Draw on the LEDs or something
    
    FastLED.show();
}