Hi: I'm a long time Cakewalk user. In the past I used to have a multi port MIDI interface (now obsolete) and connect all my synths there. Now I don't have that MIDI interface anymore and, as most modern synths have USB MIDI, I connect all my synths directly to the computer. The problem is that not always want to use all my synth, sometimes I just turn on a single one and Cakewalk just mess all MIDI port selection on the MIDI tracks. The MIDI data (notes, etc) is sent to the wrong