Instead of copypasting the distribution lines over and over with different items in them, do a loop over two tables, one of the spawn locations and one of the items. Do this twice, once for the .1 chance and once for the .7 chance (or however many you have). It would also be best to not have cassette spam if you calculated the chance for a cassette to be your base chance (ex. .1) divided by the number of cassettes - same for vinyl if you add a lot of those.