Hi Welcome to DUC.
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... how do I play the instruments without having to arm any tracks?
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You don't, the tracks need to be armed to receive MIDI for the VI.
There are other DAWs probably better suited for this application.
More importantly there are real-time performance apps better suited for this application. Like NI Kontakt (!), Ableton Live (OK a DAW as well), LiveProfessor, GigPerformer, MainStage, and others.