In this short quick series, we'll take a look at a number of simple two Operator FM-X stacks and discuss how you can begin to learn to program source waves using FM-X intuitively, by ear - without any heavy math. Please download the example Performance (P4.X7B). This is a MONTAGE Connect bulk file. It is assumed you are making the adjustments and hearing the results yourself. One of the best ways to gain an understanding of the FM-X engine is to experiment with a few key parameters and work with them until you're comfortable with what they do and exactly when they do it.