Convert chord progressions into Nashville numbers, transpose them cleanly into a new key, work in major or minor, and keep chord colors like maj7, m7, sus, add9, and slash bass notes attached to the chart.
Accepted examples: C - G - Am - F, Cmaj7 G/B Am7 Fadd9, Dm7 - G7 - Cmaj7, Am - G - F - G, E - B/D# - C#m7 - Aadd9