Okay, (finally) getting another look at the examples... What I think ChuckSound does, if you use Paul Batchelor's class 'CSEngine' (from the example file with that name) you can use chucK to compile and run one entire csd per shred -- which can be pretty near a blank template where instruments can be effectively added by other shreds via the function eval()
and have notes sent to that instrument by any shred using that same public class.

I gather that multiple notes could be sent to that same instrument, or several such instruments, for that same instance of the class to send to chucK for rendering into actual sound.