thanks, good to know but as describe in AJ manual is different:

• New GUITAR MODE [Premium, and Deluxe Packages] – Use your Left hand/chords or Right hand (when Pianist/Bassist is activated) to manually strum AUDIO GUITAR parts. Simply play a chord by pressing HARD and then while holding the chord down, use any finger on the left (or right in Bassist Mode) to ‘strum’ AUDIO GUITAR live.