harmony

Hi! Apologies if this is elsewhere in the forum, I couldn't find the topic anywhere. Does anyone know what the "Harmony" drop-down list is for in app version? It's in the playback section underneath instrument selection. It's been continually grayed out for me but I am very curious... I've...

I am used to 'abstract' the function of harmonies memorizing them as roman numbers for easy transposing. I totally love the option to show the sheet as 'absolute' chords, relating to the key as numbers; you call it 'Number Notation' ... The only thing is that I am back in math class when I see...