Nice job! The stock arp patterns are a nice touch. I’m surprised no one in here mentioned the original Smart Guitar instrument in GarageBand on the iPad [1]. It actually works in a very similar way, and feels very satisfying to use.

It basically gives you the chords for a given key signature aligned verticall, and then you can use your finger to pick or strum - it even lets you do string bends.

Question: OOC, where did you source the string sample recordings from?

[1] - https://imgur.com/a/6jQiUJp