Pro Tools Software – Digital Music Software

Midi Keyboard in live situation?
How would one go about using a midi keyboard, M-Audio Axiom Pro 25 to be more specific, in a live situation like a regular keyboard? audio Midi Pro i.e. Playing notes on the midi keyboard and those notes coming out of a P.A. in real time.My current understanding is that a midi keyboard can not be directly plugged into a P.A., it has to go through something first.It is this 'something' I'm interested in.Any information on the topic would be appreciated.TG.
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