I believe there was an addendum added to the package that notified the user about the extra sounds, so I read somewhere. The card should have a silkscreened "SCC-1A" I think to distinguish it from the regular SCC-1. Check yours and report please. I hope someone else can fashion a test to distinguish the two cards.
Yes, I also remember reading about the addendum about the extra sounds. Went through the packaged docs, but was unable to locate. When you mentioned the possible "silkscreened 'SCC-1A'" designation: by "silkscreened", do mean as printed on the SCC card itself? Thanks