To transpose down one step (semitone) using the chordie feature is great but you often end up playing in some potentially quite difficult keys.
For example, if the song was in G, chordie will transpose it into F#, which could prove tricky for some.
The solution (which is echoing what Russell said) is to use chordie to transpose down, and then the capo to get back up to where you want to be.
Example: transpose down 5 on chordie and then capo up 4 frets. Down 5 and up 4 means overall you are down 1.
Why down 5 you ask?
If the original is in C, for example, this puts it into G and keeps the chord shapes fairly simple and open.
The trick is to use chordie to transpose down till you get a key with chord shapes you are happy with. Then, note how many steps down that was, and capo back up one step less.