Audio Cloned to a Part isn't Playing?

I have this aerial sound system that uses parts positioned around the player. It then picks a random part, random sound, and plays the sound to the part.

The problem is that it gets to the point where it clones the sound (I think) but it just doesn't play the sound.

I think it's the way I'm finding the sound to copy but I've tried a few different things and they never worked.

script:

local parts = {
    parta = Instance.new('Part', workspace),
    partb = Instance.new('Part', workspace),
    partc = Instance.new('Part', workspace),
    partd = Instance.new('Part', workspace),
    parte = Instance.new('Part', workspace),
    partf = Instance.new('Part', workspace)
}   

for i,v in pairs(parts) do
    v.Anchored = true
    v.CanCollide = false
    v.Transparency = .5
end


while true do
    wait(math.random(2,3))
    local character = game.Players.LocalPlayer.Character
    if character then
        parts.parta.CFrame = character.HumanoidRootPart.CFrame - Vector3.new(-20,0,0)
        parts.partb.CFrame = character.HumanoidRootPart.CFrame - Vector3.new(20,0,0)
        parts.partc.CFrame = character.HumanoidRootPart.CFrame - Vector3.new(0,-20,0)
        parts.partd.CFrame = character.HumanoidRootPart.CFrame - Vector3.new(0,20,0)
        parts.parte.CFrame = character.HumanoidRootPart.CFrame - Vector3.new(0,0,-20)
        parts.partf.CFrame = character.HumanoidRootPart.CFrame - Vector3.new(0,0,20)

        local numeral = math.random(1,6)
        local ran = math.random(1,2)
        local c = parts["parts"..numeral]
        if character.HumanoidRootPart.Position.Z < workspace.maincheckpoint.Position.Z then
            print('going along')
            if ran == 1 then
                print('jump')
                local thingstocopy = workspace.sounds.ambient.jump:GetChildren()
                local thingtocopy = thingstocopy[math.random(#thingstocopy)]
                local copy = thingtocopy:Clone()
                copy.Parent = c
                wait(.3)
                copy:Play()
                wait(copy.TimeLength)
                wait(.1)
                copy:Destroy()
            end
            if ran == 2 then
                print('subtle')
                local thingstocopy = workspace.sounds.ambient.subtle:GetChildren()
                local thingtocopy = thingstocopy[math.random(#thingstocopy)]
                local copy = thingtocopy:Clone()
                copy.Parent = c
                wait(.3)
                copy:Play()
                wait(copy.TimeLength)
                wait(.1)
                copy:Destroy()
            end
        end 
    end
end