Root note when using ChordProgression.from_string()

[flexiblestoic]

Hi,

Fantastic piece of software. I was wondering if there is a way to define the root note when injecting the chord progression from a string?

Thanks,
Chris

[jonathangjertsen]

I'm not sure what you mean - the root note will be derived from the chord names in the string. The octave is chosen arbitrarily though - is that what you want to be able to specify?

Maybe you can provide some example code showing how you would like to use it?

[flexiblestoic]

Yes, I was thinking about the octave of the root note. I would use it like:

prog = ChordProgression.from_string("4F -- 3Am -- 4Dm7 -- 4F --")

Meaning the roots would be F4 A3 D4 and F4. The octave number before the note would be optional.

[jonathangjertsen]

I see! Having the octave in front is a nice solution, I don't think it conflicts with any of the existing notation. It could probably be extended to solve #1 as well. I'll give it a go!

[flexiblestoic]

#1 Indeed. So the octave in front wouldn't the best solution to generalize. Maybe an optional dot notation?
The first inversion of C major starting on E4 would be E4.C
A C major starting on C5 would be C5.C

[jonathangjertsen]

I've added support for the octave in front, available in version 1.0.0 (pip install jchord==1.0.0)

[jonathangjertsen]

The first inversion of C major starting on E4 would be E4.C

If you just need to change the bass note, this is supported with slash chords, in this case you would write "5C/E". The "/E" adds an E below the root

[flexiblestoic]

Just tested. Works awesome. Thanks Jonathan!