(
// Operator prototype
var op = { | freq=100, mod=1, amp=0.2 | 
    { SinOsc.ar(freq * mod, 0, amp) };
};

// Modulators for operator 2
var rnd_fre_mod = { LFNoise0.kr(0.3, 4, 0) };
var rnd_fre = { LFNoise0.kr(abs(rnd_fre_mod), 10000, 0) };
var rnd_amp_mod = { LFNoise0.kr(0.3, 10, 0) };
var rnd_amp = { LFNoise0.kr(abs(rnd_amp_mod), 1000, 0) };

// The operators
var op2 = op.value(freq: {SinOsc.ar(rnd_fre, 0, rnd_amp)});
var op1 = op.value(freq: 400,
                   mod: op2,
                   amp: 0.5);
{([op1, op1])}.play;
)