
How do I "set up my input" for a track?
I'm following the tutorial "First Midi Song - Part 1" on youtube:
https://www.youtube.com/watch?v=x2x4rZWGWc0
At 3:20 the tutorial starts giving directions on how to "set up your input".
I'm not sure exactly what this series of steps does. But the exact steps shown in the tutorial can't be done on current version of Reaper. The UI is different on current versions.
What is the instructor doing exactly?
And how can the equivalent be done on the current version of Reaper?