This last part of the tutorial will be a bit different. You have more freedom to choose and the goal is that at the end you may have a finished application you may feel proud of. We offer a couple of alternatives. You may choose one of them, both or even propose your own.
Option A:
Taking the SMS Example as a base, the goal is to have a more interesting GUI. To start off you can just take the GUI of the example and adapt it to work with your code. Then you can work adding some utilities of your own.
Option B:
Now that we have the Analysis-Synthesis scheme implemented, we can implement some spectral transformation. To do so you may use any of the spectral transformation algorithms available in the "DAFX:Digital Audio Effects" book edited by Udo Zoelzer or take the SMSTransformations available in the repository to derive your own.