Hello, The following reliably seg faults chuck (I'm using git master) $ chuck --help chuck version: 1.3.2.0-beta-1 (chimera) mac os x : intel : 64-bit http://chuck.cs.princeton.edu/ http://chuck.stanford.edu/ $ chuck examples/swirl.ck Segmentation fault: 11 swirl.ck: class Swirl extends Chubgraph { Gain _cv; inlet => Pan2 pan => outlet; { _cv => blackhole; spork ~ _tickAtSampleRate(); } fun void _tickAtSampleRate() { while (true) { 1::samp => now; tick(_cv.last()); } } fun float tick(float cv) { cv => pan.pan; } } SqrOsc lfo => blackhole; 0.1 => lfo.freq; 1.0 => lfo.gain; Swirl swirl; lfo => swirl._cv; SinOsc osc; 220.0 => osc.freq; 1.0 => osc.gain; osc => swirl => dac; 10::second => now; <<<"done">>>; --- michael