DIM_GOING_LEFT
dim->tune_state = DIM_GOING_LEFT;
case DIM_GOING_LEFT:
case DIM_GOING_LEFT:
dim->tune_state = dim->profile_ix ? DIM_GOING_LEFT : DIM_GOING_RIGHT;
case DIM_GOING_LEFT:
if (dim->tune_state == DIM_GOING_LEFT) {