Note that as you add more pieces, the system
becomes more complex and routing becomes more elaborate. When you add
digital components to a modular multi-track rig, the pathways change. A
patchbay is not needed if one has a digital mixer. Busses can be
configured with software switches and setups can be saved and recalled.
Also, some of the better digital mixers don't require an audio interface to
connect to a computer. They may have a firewire option that links the desk
to the DAW. These systems tend to be more expensive.