     return rval;
 }
 
+/* modeSolid draws a solid color across all LEDs, according to the parameters
+ * HUE, SATURATION, VALUE. */
 void modeSolid() {
     fill_solid(&leds[0], NUM_LEDS, CHSV(
         parameters[PARAMETER_HUE],

    parameters[activeParameter] += rotary_delta();
    parameters[activeParameter] %= parameterMax[activeParameter];

    /* Only one mode for now */
    modeSolid();
    FastLED.show();
}

    CHSV(219, 255, 255)
};

/* Initial setup, called once on boot. */
void setup() {
    FastLED.addLeds<NEOPIXEL, PIN_LED>(leds, NUM_LEDS);
    pinMode(PIN_BUTTON, INPUT_PULLUP);
