You can route MIDI tracks from one computer to VST instruments on another computer. This allows you to use one computer for playback and recording and the other one as a VSTi rack.
Procedure
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Record a MIDI track into computer 1.
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Once you have finished recording, route the MIDI output of that track to VST System Link MIDI port 1.
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On computer 2, open the VST Instruments window and assign an instrument to the first slot.
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Route the VST instrument channel to the desired output bus.
If you are using computer 1 as your main mixing computer, this would be one of the VST System Link output busses, connected to computer 1.
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Create a new MIDI track in the Project window of computer 2, and assign the MIDI output of the track to the VST instrument you created.
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Define the MIDI input of the track as VST System Link port 1.
Now, the MIDI track on computer 1 is routed to the MIDI track on computer 2, which in turn is routed to the VST instrument.
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Activate monitoring for the MIDI track on computer 2, so that it listens and responds to any incoming MIDI commands.
In Cubase, click the Monitor button in the track list or Inspector.
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Start playback on computer 1.
Computer 1 sends the MIDI information on the track to the VST instrument loaded on computer 2.
Result
Even with a slow computer, you should be able to stack many extra VST instruments in this manner, considerably expanding your sound palette. VST System Link MIDI is also sample-accurate, and thus has much tighter timing than other hardware MIDI interfaces.