I don't know the first thing about memblocks, but I think that's going to be the way. Don't know how easy it would be, but I guess you'd turn your sounds into memblocks using make memblock from sound, extract the sound data, combine them together in a new memblock, then turn that back into a sound using make sound from memblock - then save sound as a wav. Someone else here I'm sure will be able to give a better explanation than that. If you can get in touch with a guy called Tommy S, he might be able to help as I think he was doing something similar.