Before you start please read:

Reaper Piano Roll: C Major Scale – Guitar as reference(C3-C4)

C Major Scale: C2 – C3

C2 – D2 – E2 – F2 – G2 – A2 – B2 – C3

C2 D2 E2 F2 G2 A2 B2 C3(Middle C)

Highlighted below:

Same scale, different positions: