What the example contains is:
{
"layers": [
{
"image": "000",
"image_mode": "stretched",
"palette_shift": 0
},
{
"image": "009",
"image_mode": "tiled",
"effect": {
"type": "horizontal_interlaced",
"amplitude": 256,
"frequency": 3
},
"palette_shift": 2,
"scroll": [0, 1]
}
],
"configurations": {
"alta": [1, 0],
"default": {
"layers": [1, 0],
"speed": 2
}
}
}