display the confidence in each chord estimation (eg with a color scale), whenever possible
This way it is easy to avoid playing the most inconsistent ones
Matej Peterka commented
Great idea! I agree that this would be very important thing to do. You don't need to introduce new colors, if you want to keep the interface simple, you could just display the chords in bold font normally, and if there is a chord that is slightly above threshold of confidence, put it in normal or thin font.
And if very uncertain, show the second and perhaps even third alternative guess
This is definitely an interesting idea that we might consider implementing. However, the challenge will be to the keep the interface as simple as possible. Thanks for your feedback, it is highly appreciated.