(
SynthDef(\gen, {
  |freq=440, amp=0.2, range=10|
  Out.ar(0, Gendy1.ar(minfreq: freq-range, maxfreq: freq+range,mul:amp))
}).add;

SynthDef(\sine, {
  |freq=440, amp=0.2, range=10|
  Out.ar(0,
    SinOsc.ar(
      freq: freq + SinOsc.kr(
        Rand(freq*0.5,freq*2),
        mul:range),
      mul:amp))
}).add;
)

(
~task_gen = {
    |gC, spawnrate, spawnnum, length, type|

  var spawnMod = spawnrate / length;
    Task.new({
    var globCenter = gC;

        spawnnum.do {
            var t = Task({
                var nuamp, center = globCenter + 10.rand2, range = 10;

                length.do {
                    var synth = Synth(type,
            [\freq, center + range.rand2,
              \amp, 0.0,
              \range, 20.rand2
          ]);

                    length.do {
                        |i|
                        nuamp = i.asFloat / (length.asFloat *10);

                        //nuamp.postln;
                        synth.set("amp", nuamp);
                        0.01.wait;
                    };

                    Interval(length, 0, -1).do {
                        |i|
                        nuamp = i.asFloat / (length.asFloat*10);

                        //nuamp.postln;
                        synth.set("amp", nuamp);
                        0.01.wait;
                    };

                    synth.free;
                };
            });
            t.play;

            spawnrate.wait;
            globCenter = globCenter + 10.rand2;
      length = length - 1;
      spawnrate = spawnrate - spawnMod;
        };
    });
};
)

(
~gen_func = {
  |step, start, range|
  {
    |i|
    var rate = [3.0,4.0,5.0].choose;
    var num = [10, 20].choose;
    var len = Array.fill(20, {|i| 10 + i}).choose;
    var center = Array.series(range / step, start, step).choose.midicps;
    var type = [\sine,\gen].choose;
    var task = ~task_gen.value(center, rate, num, len, type);

    task.play;
    i.wait;
  }
};
)

(
~task = {
  |numtimes|
  Task.new({
    var step = 5, start = 60, range = 40;

    numtimes.do {
      [1.0,2.0,3.0].do(~gen_func.value(step,start,range));
    }
  });
}
)

~task.value(10).play;