Some 4 way close voicings are playable on guitar, some on select string groups and some not at all. It is the interval of the minor and major 2nds found between the Ma7th/b7th and the octave that causes the biggest problem.
I play all of them in a non-simultaneous way, broken up into diads 2+2, 2+2+2, 1+3, 3+1, 3+3 or arpeggiated.
CEGA---DFG#B---EGAC---FG#BD---GACE---G#BDF---ACEG---BDFG#---CEGA
Pretty stretchy stuff. |