I have been asked to help design an aid that would allow someone with one hand to play a guitar. This particular person will probably need to have a foot pedal controlling a device for what would be the 'strumming' hand.
The only thing I have found that could be modified/controlled using some electronics is at http://www.thehammerjammer.com/index.html Ben Heck also did a 2 part video for an electromechanical device https://www.youtube.com/watch?v=RlNKix43ULY, but his is a bit invasive on the guitar!
Other devices that allows chords to be played: http://makezine.com/2012/04/23/arduino-mod-lets-disabled-musicians-play-guitar/ https://www.ultimate-guitar.com/news/general_music_news/you_dont_have_to_bother_learning_guitar_anymore_this_mechanical_device_will_do_it_for_you_now.html but these are at the 'wrong end' of the guitar.
Any ideas? Looking for concepts or prior projects at this stage rather than detailed technical discussion of possible implementation.