I have a Garcia charango - bought from Elderly, but they don't carry them now. Loads better than the one I bought on the street in Quito, which had binding applied with Bic pen.
I play in standard charango tuning, which is similar to uke, or guitar capoed at fret V. The Duran/Pedrotti book is a good place to start with South American styles:
https://www.amazon.com/Charango-Meth...s%2C188&sr=8-1
D.H.