( x = SynthDef("varianttest", { |freq=200| Out.ar(0, SinOsc.ar(freq, 0, Line.kr(1, 0, 0.5, doneAction: 2))); }).variants = (alpha: #[\freq, 400]); x.store; ) no worries: Synth("varianttest.alpha"); but: Pbind(\instrument, "varianttest.alpha").play; FAILURE n_set Node not found