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Code Block
-- start with an empty program, remove all existing layers
layers = this.parent:findLayers()

if layers then
   for i, layer in ipairs(layers) do
       this.parent:removeLayer(layer)
   end
end

-- table with layer presets from Skylab
layerPresets = {
   { name = "Ambient Pad 01", path = "vstsound://724ACB205EFF46F885735D1B216C37AD/.AppData/Steinberg/Skylab/Sub Presets/Layer Presets/Ambient Pads/Ambient Pad 01.vstpreset" },
   { name = "Ambient Pad 02", path = "vstsound://724ACB205EFF46F885735D1B216C37AD/.AppData/Steinberg/Skylab/Sub Presets/Layer Presets/Ambient Pads/Ambient Pad 02.vstpreset" },
   { name = "Ambient Pad 03", path = "vstsound://724ACB205EFF46F885735D1B216C37AD/.AppData/Steinberg/Skylab/Sub Presets/Layer Presets/Ambient Pads/Ambient Pad 03.vstpreset" },
   { name = "Ambient Pad 04", path = "vstsound://724ACB205EFF46F885735D1B216C37AD/.AppData/Steinberg/Skylab/Sub Presets/Layer Presets/Ambient Pads/Ambient Pad 04.vstpreset" },
}
-- create table with the preset names
function getPresetNames()
   presetNames = {}
   for i, preset in ipairs(layerPresets) do
       presetNames[i] = preset.name
   end
end

getPresetNames()

-- remove the old layer after the new one was added
function removeOldLayer(progressInfo)
   local newPreset = progressInfo.root
   if oldPreset then
       this.parent:removeLayer(oldPreset)
       print(oldPreset.name.." removed.")
   end
   oldPreset = newPreset
end

-- append the preset in a separate thread
function appendNewLayer(progressInfo)
   if progressInfo.root then
       this.parent:appendLayerAsync(progressInfo.root, removeOldLayer)
       print("Appending "..progressInfo.root.name.."...")
   end
end

-- load the preset in a separate thread
function onSelectPresetChanged()
   progress = 0
   progressInf = loadPresetAsync(layerPresets[SelectPreset].path, appendNewLayer)
   print("Loading "..layerPresets[SelectPreset].name.."...")
end

-- define a parameter for selecting the preset to be loaded
defineParameter("SelectPreset", "Select Preset", 1, presetNames, function() onSelectPresetChanged()
end)

-- monitor the progress with onIdle
progress = 1
function onIdle()
   if progress < 1 then
       progress = progressInf.progress
       print("Progress: "..(progressInf.progress * 100).."%")
   end
end

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