    emitter.threed = true;
    emitter.flicker = false;
    emitter.numParticles = NUM_PARTICLES;
-   emitter.maxVelocity = 1.0 / FPS;  // TODO: use an intuitive unit
+   emitter.maxVelocity = 0.15 / FPS;    //1.0 / FPS;  // TODO: use an intuitive unit
 }
 
 void loop() 

#define MILLIS_PER_FRAME (1000 / FPS)

Adafruit_NeoPixel strip = Adafruit_NeoPixel(PIXEL_COUNT, PIXEL_PIN, PIXEL_TYPE);
ParticleEmitter emitter = ParticleEmitter(PIXEL_COUNT, MAX_COLOR);
char action[64];
char parameters[64];


        // Update this particle's position
        Particle prt = emitter.updateParticle(i);

        float zScale = (emitter.threed ? (1.0 - prt.coord.z) : 1.0);
        double tailLength = (1.0 + abs(prt.velocity.x * 15) * zScale);
        int16_t startSlot = emitter.numPixels * prt.coord.x;
        int16_t currentSlot = startSlot;
        int16_t oldSlot = currentSlot;
