Popey,

When you capo (as a verb to indicate putting a capo/noun on your guitar) you are changing the key you are playing in, using the "chord shapes" from your original key.

You need to transpose the chords for your Autoharp to match. Depending on what chords you have, this may or may not be possible. Most modern autoharps are set up so that to change key, you orient yourself to the transposed first chord, and the other chords will be in the same proximity.

It frustrates the daylights out of me that guitarists need only capo to play in E, A or B, and I haven't a hope with my 21 chord Autoharp.

Joanne in Cleveland