(
fork {
    var size = 3.rrand(10).debug('envelope size');
    {|dur=1, amp=0.8, pan = 0|
        Pan2.ar( 
            SinOsc.ar(
                EnvGen.ar(Env(\freq_l.kr(400!size), \freq_d.kr(0.1!(size-1)), \freq_c.kr(1!(size-1)))), // named controls
                mul: EnvGen.ar(Env.sine(dur, amp), doneAction:2)
            ).tanh, 
            pan
        );
    }.asSynthDef.name_("dzin").add;
    Server.default.sync;
    Pbind(*[
        instrument: \dzin,
        delta: Pseg(Prand(1/2.pow((0..3)), inf), Pwhite(1,4), \lin),
        dur: Pfunc({ thisThread.clock.beatDur }) * Pkey(\delta), // set dur to delta duration
        freq_l: Pcollect(`_, Ptuple({ Pbrown(0,1,0.05).linexp(0,1,40,4e3) } ! size, inf)), // array refs - freq envelope levels
        freq_c: Ptuple({ Pcollect(`_, Ptuple({ Pbrown(-4,4,0.5) } ! (size-1), inf)) }!2, inf), // array of arrayrefs - multichannel expansion w/ different curve levels
        freq_d: Pfunc({ |e| Ref(Array.rand(size-1,0.3,1).normalizeSum * e.dur) }), // sending array ref with total dur = Pkey(\dur)
        pan: Ptuple( { Pbrown() - 0.5 * 2 } ! 2, inf ), // array - multichannel expansion
        amp: Ptuple( { Pbrown() / 10 + 0.1 } ! 2, inf ) // same
    ]).play(TempoClock(156/60));
}
)