Reads from a control bus shared between the internal server and the SC client. Control rate only. Writing to a shared control bus from the client is synchronous. When not using the internal server use node arguments or the set method of Bus (or /c_set in messaging style).
The index of the shared control bus to read from.
the number of channels (i.e. adjacent buses) to read in. The default is 1. You cannot modulate this number by assigning it to an argument in a SynthDef.