Adding to Pat's excellent suggestion you could DL some classical quartet MIDIs and study them. You google/bing classical quartet MIDIs. Here is one page that I found:

http://stringsound.com/Page11.html


I get most of my exercise these days from shaking my head in disbelief.


64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware