Since we have fixed our initialization problems, let's look at the MIDI/GUI keyboard or what we could call the nput stage of our synthesizer patcher. For our convenience, both MIDI input and the [kslider] object (so the keyboard) have been packed into an object called a bpatcher. Bpatchers can load patchers that are saved in the search path, or they can be edited in place. To get familiar with them, create a new patcher, make a new object, and type in bpatcher. An empty square will appear. Now, we have two options. We can go to its inspector (command/Ctrl + I) and enable embed patcher in parent. Then, we can right-click on the bpatcher itself and choose Object → New view of <none>. Now, we can edit the contents of the patcher. The second and more common way is to leave the embed patcher in the parent unchecked and provide a patcher file in the bpatchers patcher attribute in its inspector. In this case, the bpatcher object is not embedded; let's open it and...