A MIDI Virtual Rack is a full rack of fx. Each one has extended numbers of parameters. A 7600 can provide racks with up to 5 full blown units in a preset (Eventide/TC/Lexi) stuff with 10 snapshots you can recall with a single MIDI CC.
That isn't possible on Eclipse. A small number of "racks" have been added in the latest OS but they do not offer snapshots, nor the large variety of fx combinations like in the 7600.
There are some Lexi and Eventide verbs from the bigger units in the Eclipse. You can do ducking delay but not as in the 2290. No 1210.
best
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