(
name: 'delayed_pulse_drone',
func: {
  |freq|
  var ap;
  var numWaves = 6;
  var formants = Array.series(numWaves, 1, \freqAddStep.ir(1.25));
  var freqs = formants * freq;
  var widths = { Rand(0.0, 1.0) }!numWaves;
  var sig = Pulse.ar(freqs, widths);

  sig = sig.collect { |s, i| s * (i + 1).reciprocal; };
  sig = sig.collect { |s| OnePole.ar(s, \onePoleCoef.kr(0.5)); };
  ap = numWaves.collect { |it|
	AllpassC.ar(
	  sig[it],
	  0.2,
	  SinOsc.kr(\delayModFreq.kr(0.1), rrand(0.0, 2pi)).range(0.08, 0.1))
  };
  sig = LinXFade2.ar(sig, ap, \drywet.kr(0.5));
  sig = SplayAz.ar(numWaves, sig, orientation: \orientation.kr(0.5));

  sig;
},
useEnv: true,
specs:(
  freqAddStep: [1.0, 10.0],  
  onePoleCoef: [0.0, 0.98],
  drywet: [0.0, 1.0], 
  orientation: [0.0, 10.0],	  
  delayModFreq: [0.0001, 1.0]
),
defaults:(
  attack: 0.01,
  release: 0.1,
  curve: 1
)
)