weird-sequencer-behavior.js

var customEnvelope = {
    levels: [0, 1, 0],
    times: [0.5, 0.5]
};

var gateDef = {
  ugen: "flock.ugen.sequencer",
  durations: [1, 1, 1],
  values: [1, 1, 1],
  options: {
    resetOnNext: true
  }
};

flock.synth({
    synthDef: {
        ugen: "flock.ugen.sinOsc",
        freq: 270,
        mul: {
            ugen: "flock.ugen.envGen",
            rate: "control",
            envelope: customEnvelope,
            gate: gateDef
        }
    }
});