I want to create custom scale based on standard tuning.
I just confuse with I, II, III symbol means
Is it true if I = C, I# = C#, II = D, II# = D#, and IV = B note ?
So if I want to create pentatonic scale, some I symbol can double note?
like set to I = C, I# = C
IV would be F, VII = B.
It’s roman numerals for musical scale degrees. The # suffix means the degree is raised by a half tone.
As the regular keyboards have 12 keys per octave, but scales usually have 7 notes, some keys should be mapped to the same degrees.
Hope this helps, let us know if you have further questions. 
Thank you, it help, I have try and works.
