How do you call guitar technique for playing one instrument, but making it sound like there are at least two guitars?
Example of that might be, probably well known, Tommy Emmanuel's Classical Gas interpretation.
Since I found out that questions for identifying technique aren't welcome here, here's my attemp to rephrase it, with whatever I could find over the internet.
What are the exercises that might improve generating simultanuos multiple voices on the guitar, classical/acoustic for that matter? Travis picking exercises are the most similiar to what is the goal here, but what else might be of use?