I love this idea! Unfortunately those samples were pre-made to sound like that old-school low bit/sample rate vibe. They were made long before GuyEngine was conceived, but I included them so that folks would have a bigger library to choose from.
A lot of those sounds are recreated in GuyPalette, and more of them are coming. GuyPalette is going to get more content over time, so you will hear higher quality versions of those sounds.