I am currently working on a tutorial in LUA. How do I add sound to my Lua code?

Question

Newbie here currently working on a soundpad tutorial in Lua code. I seem to be stuck at inserting the sound. this is my first attempt at coding. any help is really appreciated.

 local sampleNames = {
    {"kick","snare","",""},
    {"hat","","",""},
    {"","","",""},
    {"","","",""}

}

function eventChannel1(sender, event)

    if event.ButtonDown then -- was the event caused by a button being pressed?

        local sampleName = sampleNames[event.Y][event.X] -- get the name of the sample from        our table
    local sample = gdt.ROM.User.AudioSamples[sampleName] -- load that sample from our assets

    if sample ~= nil then -- is the sample we tried to load anything but nil?
        gdt.AudioChip0:Play(sample, (event.X + event.Y * 4)) -- play the sample we loaded
    end

end

end

I tried everything the tutorial told me to do. I expect to hear my keys make a "kick", "snare" and "hat" sound.