Watch the Drop 2, 3, 4 Voicings online guitar lesson by Brad Carlton from Guitar Lab: The Golden Arp

The 2nd inversion drop 2, 3, 4 voicing of the add 9 chord produces four layouts on the fingerboard. They are very effective as the 3 is the lowest voice and when played over a root bass note, a very full sonority is produced. Various fingering options are presented in the video and I will show you how to reference the CAGED system.