Capo’s are used on the neck of string instruments so you can shorten the playable length of the strings resulting in a higher pitch. Musicians use capos so they can raise the pitch and play in a different key while still using the same fingerings they would use if they were playing open. Kyser makes a great 6 string acoustic guitar capo. It fits the neck and fingerboards of 6 string acoustic guitars perfectly giving you the pitch you were looking for. It is simple to use and can be used with one hand!