If I understand correctly, you want to dump each channels separately, correct? Multidumper by Kode54 should do the trick. If you only want to get samples alone, look for spctool (DOS program, but I know there is a Windows version floating around).
Multidumper would do the trick, I want to try what the guy in the video did, it sounded cool, but alttp castle and forest theme remixed would be cool. I know there are tons of remixes and covers but none really using .spc