NB Throughout the manual, text in blue describes functions which you might never discover by merely using the program, as they are not documented elsewhere.
The Keyboard Window
(Cmd-K to open/activate)
This is the main Chord Studio window. It features a velocity sensitive (!) 88-note grand piano keyboard. Click on the keys (or play a connected MIDI keyboard) to create a chord and its name will appear as you go. The nearer the front of the keyboard you click, the louder a note will sound. To hear the whole chord at once, click in the central name area. The higher buttons to the left transpose (in semitones, or octaves if you hold shift) while the lower ones invert, up or down. Default note names for black notes are: C#, Eb, F#, Ab and Bb, but typing 'h' will toggle enharmonic mode, where the enharmonic equivalent will be used. The eraser button blanks the current chord (or hit backspace).
If you don't agree with the name, you can edit it with cmd -E. See under Menus.
The far right button is the Add Chord To Chart button. This adds the currently displayed chord to the most recently selected Chord Chart window (if there is one; otherwise it will make a new one). This will replace any selected chords in that window, but if there is no selection it will be added to the end. Repeated additions will add a chord every bar (B) by default. Press a number (or 'b') to specify the number of beats to advance (1-8). Check the current advance with "show info". If you want to make a new chord chart with other than 4 beats per bar, specify the number here first (but the denominator will still be 4).
The space bar has a specially useful double function - it sends the chord to a chart and then blanks it. This makes it very easy to build up a chart with a keyboard: just hit the spacebar between chords. See also Chord Charts.
Press 'c' to centre a chord in the window. This will expand the window if necessary to accommodate a wide-spread chord.
See Notes on Chord Notation.