Watch the Close Voicings: Middle Four online guitar lesson by Brad Carlton from Guitar Lab: ii V I Options
This lesson focuses on close voicings for the ii7 on the middle four strings. Diagram 97 shows the chord voicing in red scale degrees. The remaining black scale degrees show available extensions and alterations which can be used to color the ii7 chord. This system of viewing available extensions around the chord reinforces your knowledge of intervals, and helps you develop moving lines and variety in your comping. And obviously is going to help you and you're soloing because you'll always know where the strong tones are.