Many thanks for your quick responses. I realize that I was probably not precise enough and I apologize for that. I'm a guitarist and, thanks to MidiGuitar2, I use plugins in Cakewalk that allow me to output sounds from many other instruments, but I don't leave the category of waves. I would like to be able to compare the result of my phrasing with consecutive instruments without having to replay the phrase on the guitar each time. A friend using Logic Pro assures me that he does it fluently.