Configurable item stack drop pitch change

[spaghettube]

Hey there, I'm changing the sound the mod executes when an item is dropped but it doesn't sound like I want to. This is because there isn't an option to change/disable the pitch difference from a single item to a stack (or at least I haven't found it?). Could you explain to me how the pitch change works? Are there different sounds for diferent quantities of items? Does one more item lowers x% of the pitch?