Dominant 7th chords not only have a lot of character to their sound, they can also function well harmonically and provide a lot of options for chord progressions.
The E9 neck has some great voicings for Dominant 7th chords, and many of them can be found in common pedal/lever positions.
Here are chord charts that display some options for G7 chords on the E9 neck…
The ‘D’ designates using the knee lever that lowers that string a half step.
Each number in a symbol represents that note’s fret position, just like in tablature. Click on an image for an enlarged view…