@xxx 100% they can. It's not the best method and doesn't show you how to interact with a server or WooCommerce, it's just a starting point for within HISE.
Consider building an LFO in scriptnode instead (there's really helpful example in the tutorial repository that should get you started), you can then set your LFO to one-shot by setting the ramps LoopStart parameter to 1.0.
@xxx Combo boxes start at 1, what does your knob start at? I'm guessing 0 because you are subtracting 1 from the value on line 14 and that's giving you an undefined error - my guess is that it's trying to access the array with index -1 which is invalid.