I do not use many sound samples anymore. Some VST’s use them, but if you bought the VST, you’re good. There are tons of samples all over the internet sold by thousands of suppliers. There are also many samples in the public domain. The amazing sound sets by E-MU is one of them. There really isn’t anything you can sample, that can’t be found in a samples package. Here is the reality, unless you go all out and sample off a recording, and it gets a lot of attention on YouTube, it might be discovered. The artists that made that one sound still OWNS it, so they have the right to protect their art. The piano that made that sound was purchased or rented to make it’s sound for whoever. Same with the other instruments. This is the way Copyrights work. You surely wouldn’t want other people using any of your performances, they being stolen to make money, and you nothing. Legalities are what they are. Opinion really has no place in this unless in court. The law is the law. You may run the red light, and no cop may be there to see it, but that little camera on the pole will get you a ticket in the mail. YouTube is constantly addressing copyright issues, but so is night clubs, dance halls, and restaurants. I play a lot of cover songs, but if I get caught doing it in a club, the club, and I will get billed. I know several clubs not accepting cover bands because of the fines they have incurred. I was caught once, the club had to pay, and they are still searching for a guy named Dick Handy, which is the name I gave them.