Right.
I think what Almalibrestudios is talking about when speaking of taking sound, though, would not be copyright infringement. It is taking a single sound from one work and combining it with other single sounds from other works to create a combined whole.
That said, I still have questions about what s/he has created for sale on the website. I was not listening to recordings of marbles being tossed but of musical notes being recorded that sounded very much like the works of other artists.
That said, I didn't do much of an analysis and I will trust that the attorney/musician friend of Alma's knew what he was listening to and is correct that it doesn't infringe.
My earlier advice to Alma on seeking a personal review and permission stands.