Capo allows you to enter very complex chords using very simple seach strings. This is a collection of useful information about those strings.
The root note of a chord can be entered easily, without requiring you to type a sharp or flat symbol on your keyboard. When appropriate, Capo will turn 'b' into a flat symbol, and '#' into a sharp symbol.
For instance, Capo will do the right thing with the following strings: eb, g#, c, bb
Capo implements most, if not all, of the chords listed on this Wikipedia page. Below are examples of the chord entries that Capo will allow you to enter using the keyboard.
"e5""e", "bmaj", "c major""em", "bmin", "f minor""e+", "b aug", "baugmented""e-", "bdim", "co", "a0""cadd9""e4""fmadd9", "e minor add9", "a miadd9", "gmin add9""em4", "fmi4", "g min4", "a minor 4""e-7", "gdim7", "f diminished 7", "g o7", "a07""e m7 (#5)", "fm7(#5)", "b halfdim7", "a half diminshed 7""a#m7", "g minor 7", "f mi7", "a min7""f m(maj7)""a7""f# maj7", "ebma7", "a major 7""g7(#5)", "a+7", "f# aug7", "b augmented 7""c+maj7", "g maj7 (#5)""cm9", "c minor 9", "emi9", "fmin9""f9""emaj9", "fma9""e+9", "g# augmented 9", "eb aug9""f m11", "g minor 11", "amin11""a11""fmaj11", "g major 11""e m13", "e minor 13""e13""e maj13", "e ma 13", "emajor13""g7(b5)""f +7(b5)", "g aug7(b5)", "g# augmented7(b5)""am7(b5)", "eb min7(b5)", "f mi7 (b5)""f7 (b9)""g aug7 (b9)", "f+7(b9)""f m7 (b9)", "e minor 7 (b9)""f7 (#9)", "g# 7 (#9)""f +7 (#9)", "a augmented 7 (#9)""e m7(#9)", "eb min7 (#9)""a 13(#11)""f sus2", "a suspended 2""bb sus4", "g suspended 4""f6""am6", "eb minor 6"