Singles
If you have a device which can only receive on one MIDI channel there's no problem. The MIDI Channel you have entered in the Setup window will be used. This includes old synths and most effect units.
ParentsThe same is true for selecting between complete multitimbral setups in a synthesizer (called Parent Patches in the Studio Module), since this is also most often done on the so called Global MIDI Channel, which is the one you have defined in the Setup.
ChildrenThings get slightly trickier when it comes to multitimbral instruments which can receive on several MIDI Channels at the same time (each MIDI Channel is then called a “Child” in the Studio Module). Let's get into further detail on this:
If you opened the Patch Manager from the Arrange window, the Studio Module stands a good chance of figuring out which MIDI Channel you currently intend to select a Patch for. Hence, when you use this function to set up a multitimbral instrument you should open the Patch Manager from the Arrange window and proceed as described in detail on page 133.
If you open the Patch Manager from the Modules menu, the Studio Module will (if possible) switch your device into a mode where it plays one Patch at a time on one MIDI Channel (the MIDI Channel defined in Setup). If your device is always in multitimbral mode, please beware. The Studio Module will try to select Patches on the MIDI Channel defined in the Setup window, and that could be confusing.