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Yes you can use a MIDI KEYBOARD CONTROLLER with Reason. A controller is a good thing to get as it is cheap (around $100 USD) and as you touch the notes (keyboard) and learn piano a bit
What you do with a MIDI KEYBOARD CONTROLLER hooked to Reason:
. you can "play" the sounds of the virtual synthesizers in real time
. you record in realtime what you play
Do NOT get a keyboard with sounds... just a controller... cheaper, and you control the sounds you have in your computer.
If you have any other question do not hesitate.
Take care