        || ops.reduce_speed
        || ops.increase_speed
        || ops.toggle_pause
+       || ops.skip_forward
        || ops.toggle_negative
        || ops.reset_settings
        || ops.toggle_frame_len)

  uint8_t reduce_speed;
  uint8_t increase_speed;
  uint8_t toggle_pause;

  uint8_t toggle_negative;
  uint8_t reset_settings;

int8_t frame_len;
const int8_t MIN_FRAME_LEN = -1; // Each frame lasts 0.5x normal time (25ms shorter)
const int8_t MAX_FRAME_LEN = 4;  // Each frame lasts 3x normal time (100ms longer)

const int SKIP_SECONDS = 60;
const int FPS = 20;
const int32_t SKIP_BYTES = int32_t(sizeof(frame)) * FPS * SKIP_SECONDS;

//------------------------------------------------------------------------------
// File system object.
