Harmonic progression dictation

The users interface for this exercise is not good, but here is how it works:

You press the new button, and the program play a harmonic progression for you.

Then you have to enter the answer in the entry below the music, and then press enter.

The format is the same that you use when creating lesson files for this exercise, or for id-by-name if it use harmonic progressions.

Sometime I'll explain this, for now, some examples:

I-IV-I-V
I-VI(6)-V-I
I-(6,4)V(5,3)-I

Key bindings