I stand by Saga Musix' advice, but I'd like to add a bit. I too have used these samples from other modules in the past, like everyone else did and I even shared some of those modules online for free like everyone else did.
These modules are crap now compared to what I can do today so it won't really be a problem. However if for whatever reason I would want to release one of those songs as a commercial song, I will not do that unless I replaced all those sounds with sounds I have licenses for etc.
Usually this means that I remix one of my old songs into a new song and only release the new song. So keep that in mind, that if you use those samples now, which is fine, that you remember that these have those sounds and that you work towards using sounds you can use everywhere, for example, by using a VSTi plugin and share as mp3 instead of the original module. That way, you can be assured that you are fine in the future. This will also stop people from stealing your music (eg: downloading the source, make a few changes, and then claiming it to be their own).