I was looking into this here: http://doc.sccode.org/Classes/StkInst.html
I copied the examples into supercollider, evaluated, and got this error message:
ERROR: Class not defined.
in interpreted text
line 5 char 17:
sig = StkInst.ar(Stk.at("Mandolin"),freq, gate, amp, 0.5)*env; Out.ar(out, sig.dup);
sig is written in the SynthDef as a variable. I am baffled why this isn’t working.